If you’re a dps fanatic, and like to keep in the loop on exactly which spec is progressing well, then check out http://stateofdps.com/
It takes the top 200 runs from the World of Logs project and supplies a ranking of the classes by dps output. You can further dig by class and by boss to really compare. Its really quite cool.
A note though – these logs are the best 1% people in the wow population, so do not expect to produce the same results. This site is a guide, so please treat it as such (until you can hit 22k dps, then you’ll be in the logs).