it's a questchain in hellfire peninsula in Outland. You can get it somewhere in the southwest part of the area.

http://www.wowwiki.com/Mirren%27s_Drinking_Hat

He's kind of tucked away up in the hill but if you have quest finder turned on, you'll see his !.

@David, since you are so new you do NOT realize how much Blizzard has done for the new player. You get mounts really early and SUPER cheap. Experience, upgrades, profession mats, gold etc etc just fall out of the sky now. Blizzard has done SO MANY things to make the trip from 1 to 80 so much more bearable I would have to say they care much more about you than you think. It's hard to appreciate what you have been given when it's all you know, but just imagine for one second have to walk EVERYWHERE you go. Having to group for certain quests, doing really long epic quest chains to obtain class specific pets, mounts, forms, etc etc. Adding experience gains to battlegrounds was a HUGE change. Looking for a group between levels 1 - 79 just changed things even more. I'm not upset at how easy leveling is, but it does irritate me to hear people complain.

David, I think part of the fun of levelling is supposed to be happening upon interesting quest lines. If Blizzard announced all of the interesting quests, there would be no joy of discovery. Sure, you might miss a few, but the ones you stumble upon and complete are all the better.

@Aaron: Remember the time you not only had to walk everything, but the flightpaths weren't connected? No flying from Stranglethorn Vale to the plaguelands in one smooth run and preparing a hot cup of coffee in the mean time. No sir! Every single flightpoint you'd come across, you'd have to click again. Countless are the times I returned from a trip to the toilet, only to find my character idle next to some flightmaster, waiting for the next leg of his epic trip to some deserted place at the other side of the continent. And this was on a good day. If it wasn't a good day, on my return I'd probably find some Horde thug dancing on my dead body beside that same flightmaster (who'd most likely also be dead).

"if you aren't level capped, you don't matter in blizz's eyes"

*Sigh*

@Quint I may or may not have raged a time or two upon the discovery of a dead flight master. CURSE YOU GRIEVERS!!!! STOP KILLING MY TAXI!!!!

You used to have to click on the FM for each stage of a flight??? OMG I didn't realise things were so bad in the olden days, and people actually played at this time???