'Once you play Troll, you'll never reroll.'
After all the races I've played, Troll is the one that stands out. Well, to be honest, I seriously recommend playing Troll when Cataclysm comes out, for it's fairly hard for Trolls to quest with 'lesser beings' (My perspective, sorry for the Trollin,' Mon.) like the Orcs. You see, Trolls have their own awesome zones in Cataclysm, not a valley where you have to do trials to go to another village.
Anyways, Trolls are EXTREMELY fun. No doubt about it. You might think they're just basically blue people like those blue guys in Avatar, or Big Smurfs, but sorry folks, those are Night Elves and Draenei.

(No offense.)
Beserking
Starting off, Beserking is extremely helpful. It's the 10 seconds of your time to spank those mobs, along with a handy addon, such as Sexy Cooldown, or many other ones to set your mark of your super strong Beserk.
Regeneration
You know you want to regain your health before those crocs get ya, huh?

Well, the Troll's regeneration is what you need. It increases by 10%! 10% of total Health regeneration may continue during combat as well! Wow, well, what are you waiting for? Spank those crocs, dangnabit!
Beast Slaying
Hey you, yeah you! You see that beast over there? Fight it, man. Oh? You're damage dealt to an average beast isn't high enough? Time to roll Troll, my friend, because they have 5% more damage dealt to the beast than any other race!
Throwing and Bow Specialization
You there! Stop embarrassing your guild! Roll Troll and shoot a lot faster, jeez, dude. Dig in that wallet of yours, because I know you're desperate for Troll right now. Hybrid of Troll? Forget it. You shoot faster, man. Want to shoot faster? Then stop rolling that dang Blood Elf of yours! You're not Legolas! (No offense, really.)
Da Voodoo Shuffle
Reduces the duration of all movement impairing effects by 15%. Trolls be flippin' out mon!
Anyways, yeah, they're pretty strong. I'm going to update this post from now on, I'm not going to stop here, not on the Trolls. Expect more, my friend, expect more.