I just found this website. It's amazing. I like studying different builds for different classes, and seeing which builds are more common in certain arena groups, or raids. This website updates this stuff constantly, and shows what builds are the most common, and win the most. It's amazing.
http://www.sk-gaming.com/arena/5/us/rogue/all/all/
This is the rogue page, but just select whatever you want, because I couldn't find the 'front page' or whatever.
Wow, neat. Added to the WoW References sticky!
Bahahaha! Look at the drop percentages of that harp spec! Damn. That's hilarious, and that site is awesome!
Also, they sponsor the best Russian DotA team in the world (yes, you all care).
Aw, fucky. I saw like.. one feral druid listed. Blizzard hates feral druid PvP.