Leveling alongside a warrior personally i would go for a balance specc. This will help you healing (thus increasing both your survivability). This would mean that you will also be able to nuke and because your manapool is bigger then a feral druid you will have some left for that needed heal.
Your question what role we fill in endgame, thats not so easily anwsered. It used to be healing only. But since TBC i have tanked, DPS'ed, healed and nuked. We as hybrids are blessed with divercity, we can perform in each segment and hold our ground! Tbh what role you fill really depends on what you like to do and what is needed most at any given time. I myself was resto in MC, turned moonkin for BWL and AQ 40 and later on feral for TBC/lvling. Was resto again for the Heriocs and am now tanking in Kara.........pffffftttt what a mouth full!
hehe, as you can see, as a druid you own all! ;)
have fun with your druid m8!
Edited, May 8th 2007 10:01am by Ikan