I've been testing a level 80 mage recently. My initial impression of fire was a bit off for some reason. Maybe because I didn't stack up Scorch on the target dummy...
Anyway, you can read about my tests and conclusions over at the MMO-Champion forums. I am still weighing up Frost vs. Fire. I will do a little more testing of the two tonight, under real circumstances if possible (ie. a heroic instance).
Also, I came across a funny blog, which I am adding to the side bar. It's called Angry Raid Leader and it is something that I can totally relate to, to a certain extent, having been a raid leader myself in the past. He needs to extend his bandwidth limit though, having advertised to various sites and pulled in a reasonable following!
Finally, check out the cool WotLK mounts. ;)
Gaiwyn of Proudmoore