Voicy
Resident Panty Kicker
The attunement quests were also fun for the most part, though finding groups for the BRD part of the Ony chain was a severe pain in the ass at times. The Black Morass event for Kara attunement was also a beast pre-nerf, come to think of it. But at the end of the day, you ended up with a nice shiny key that you'd worked for, and felt some sort of accomplishment for having done it.
The Kara key-chain quest was definitely a nice feeling...but it was awesomely cool being a rogue and just picking the kara lock before I had the key. No waiting outside until someone comes and opens up for you.
The only sucky thing was that in TBC there weren't enough proper players on a low pop server to progress properly. Thus resulting in most of us being stuck in Kara with tastes of Jul'aman before wotlk hit.