Reallly useful thread, (link at bottom of page)
Summary follows:
2+ years of WoW and I never knew...
The obvious ones.
Pet trainers train pets to make your pets bigger,
Talent trees 'n' talent points 3 trees per class use them - make yourselves better, stronger, faster.
Rogues can lockpick!
Elevators in UC can kill on comp freeze, bad timing,
First aid, Cooking, and Fishing. Get them, buy them, use them. Free heal = free mana or free pots or free petfood. Essential.
that if a hunter Feign's Death while a healer is midspell it cancels the heal, but the mana is still used. (Vlatch) many others have reported that this occurs when the caster has Self-casting on only. (see below)
that there is a toggle in the interface menu which causes all beneficial spells cast when you don't have a friendly target selected to land on yourself. Thus when you feign 1/2 a second before the heal lands, the heal lands on the healer, wasting the mana and overhealing. (Arid)
that you can heal hunters who are feigning death. It interupts any heals by making you lose the target, but you can retarget them and heal while they're feigned. When they get back up they'll have more health. (Ixitixl)
that warlocks can fear a target and then use Curse of Recklessness (Curse of recklessness->makes you immune to fear but doesn't break it)to break the fear without removing the fear effect. They can then throw back on Curse of Agony (removes curse of recklessness)and the mob will become feared again without the need to reapply fear. Pretty cool. (Evelgest) (Badmedicine) recommends using lvl 1 curses to prevent fear breaks and save mana.
that in beta, the warlock summon didnt require other people, we could summon inside of instances and we could summon ghosts back to their bodies to res up. (Contagionz)
that a lock could target themselves, summon themselves, hearth (to repair, get reagents, e.t.c) and then accept the summon back. (Aquenes)
that Druids can't be sheeped while in any animal form. (they are already shapechanged)(Sedyne)
that Silencing shot on a druid in bear makes him unable to Growl.(Sedyne)
that Disarm has no effect on Bear and cat form druids. (Sedyne)
that if you press shift and right click you can loot every thing on the body instantly (Tarnes) now there's the auto-loot option, so you don't need to press shift. (Kermittheorc) which reverses the shift click behaviour if you have set the auto loot check box in the Interface Options (Tauceti)
that shift-clicking a item while in the first AH window will copy the title of that item into the search bar. (Mallanna)
that pressing both mouse buttons makes you run (Radnips)
that if you just right click on a mob it auto attacks and smashing the "attack" button isn't a good idea. (Adaz)
that the " / " key on the numberpad would toggle run/walk. (Vrath)
that the (shift-b) B key will open all bags. (Kermittheorc)
that toggling number lock button is equivalent to holding down the forward key. (Autorun/Autowalk) (Serano)
that /w then hit TAB will scroll you through people you previously whispered. (Powderkeg)
that when purchasing from a vendor, you can purchase a full stack of an item by Alt-click. (Voodooudo)
that you can press the F key to assist. (Aquinas)
that Blizzard added /chatlog and /combatlog commands. (Hitch)
that you can shift click on a persons name in chat and get their Level, Race, Class and Guild info (Hounder)
that by "right clicking" a persons name from a whisper can give you a small menu of options including "invite to group" (Varley)
that you can Shift+Click items at a vendor to enter how many you want to buy, (Lakrinzo)
that you can eat and drink at the same time (Firala)
that you have to eat and drink THEN shadowmeld. (Celticminx)
that there was(is?) a flight path in Darkshire.(Kurosawa)
that you can get an item to keep summoning the Avatar of Hakkar in ST (Lightsaber)
that the Skrimshank quest series is in Gadgetstan (quest giver is on the hill)(Lightsaber)
that there is a guy who gives you a quest to swim to soutshore to deliver some liquor. He is located on a small platform between the dun Modr bridge leading to arathi highlands. Gives some good exp to

(Macdoogle)
that there are PIRATES in ARATHI? Near Faldir's Cover in Arathi Highlands. (Carlotta)
that the waves in Blackfathom Deeps come one at a time if you click the fires one at a time. (Minkyminky)
that you go to the West (I believe) twin colossus in Ferelas there's a friendly NPC that'll teleport you to the top. Great view. And getting back down involves buying a parachute

. (Adaz) Whatever you do dont try and parachute while still mounted or you will die and your body will be impossible to get to. (Drowurden)
that wolves kill random rabbits that pass by. (Hounder)
that the Sea Giants fart bubbles. (Lakrinzo)
that mobs can sometimes run straight up walls. (Nikogrel)
that Crocolisks have 6 legs (EƤrend)
that you can hold down the alt key and use the directional keys while chat is open to move your text cursor around (left and right arrows), or to flip through previously sent messages (up and down arrows). Always infuriated me when I'd try to go back to fix a typo and would end up turning my character instead. (Sedyne)
that Imps said lines of dialogue at random intervals (pre-BC). (Stabistabi)
that you get rested xp (a bonus on the XP when you kill a mob) if you return to an inn when you logoff. (Midnite) (Valkri)
that feign death can be resisted.(Relientk)
that there is a Moonwell in Stormwind!(Shadgalaul)
that Sunder Armor stacks.(Sonicadin)
that if you /wave or /salute guards they will reply with the same emote. (Onimura)
that when you sheep or pig a target, the sheep or pig can be a different color. (More noticeable with the pig). (Onimura)
that you can swim underwater while dead. I used to go to spirit healer whenever I died underwater. (Grazer)
that there was a druid trainer in Stormwind (Whitecrow)
that you can "scare beast" (hunter channeled spell) a druid in cat / bear / travel form and Shamans in GhostWolf form pretty much the same as warlock fear (Killir)
that you can change an option to "fast text" quest messages. (Dogonne)
that if you type /a or any letter at all, and then press tab, it'll cycle through all the emotes/commands alphabetically! Found some funny stuff that way. (Hiali)
that a dwarf warrior didn't need to have an ammo pouch in order to use a bow or a gun

(Nakhu)
that paladins can use axes! (Zulfate)
that you could turn off the tips on the loading screens - (Ashanta)
that if you hold the left and right mouse button down at the same time, you will run automatically and be able to steer your character around by moving the mouse (while still holding down the left and right mouse buttons).(Spozzeran and a couple of others)
that you can change the colour of nearly all the text in the game... I've made all my /Yell s bright pink... (Evilolina)
that Sunder Armor can be used outside of Defensive Stance. (Drakkhen)
that Ctrl+Right-Clicking on a stack of items quickly splits it automatically. (Dekiel)
that if you are a mage you can open portals for alts too! Form a party with a friend. Open portal to major city. Log out. Log in with your alt. Portal is still there, step in

(Erp)
that Warriors can cleave and Rend in any stance (Arkadius)
that Trolls have 3 toes on each foot (Nikz)
that Last Stand leaves you with 1 hp

(Damiennight)
that druids can use fist weapons. (Talion)
that you can /dance with the ghosts of the citizens at the unkeyed entrance to Stratholme, and they will stop attacking you and dance with you for a few seconds

(Firala) and you can also /rude them and they slap your face. (Katarungan)
that I had to do a quest to get protection stance. (Frinto)
that you could challenge the opposite race to a duel if you were in their area (right click their portrait and challenge them and stuff). (Sonofarth)
that to talk to other people in general chat you actually have to type /1 first(Jodix)
that there was a flight path in Loch Modan (Dowscar)
that you could adjust the transparency behind the party frames. (Drysc) Interface Options. "Show Party Background" Right click near party frame and use the slider. (Drysc)
that priests can also use dispel magic on shammies to knock them out of ghost wolf. (Kibeth)
that night elves can shadowmeld in moonkin form and eat/drink at the same time. (Enya)
that you can ctrl + left click an item and it would show what it would look like on your character. (Thorgrinn)
that the quest in western plaguelands with the apples that disguised you as a scarlet person, allows you to get more apples as long as you wanted if you keep abandoning the quest(Kasshaaz) Does not work in Scarlet Monestary though
that the ogre called "Draz'zilt" in brackenwall village spelt backwards is blizzard. (Gehenna)
that Sleep beast works on druids in forms AND shaman in ghost wolf (Moontoya)
that Bear/Warrior Charge can be fired midair and save you from splattering, even if you charge a critter before you hit the bottom. (Moontoya)
that you can only play one faction on PvP servers, but you can make and play both on PvE ones! (Maddoz)
that an undead can cannabalise on a feigning hunter.. it was disturbing at the time too. Got up and the undead was still in the cannabalise action. (Xzylum)
that you get new spells every even level after level 9 and before 60.. after 60 it's every level for most classes (rogues being an exception for some reason).(Narintia)
that First Aid, Cooking and Fishing are not primary professions and everyone can have them (Malkana)
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