Well, you can see what classes I play the most in my sig.
Apart from that, I've got:
70 Hunter
39 Druid
49 Warrior
12 Warlock
2 Mage
There's a post of my UI up 2-3 pages back in the "Post Your UI" thread. I've been trying to do cool interfaces for about 3 years, started on the hunter, then the priest. Now I do most of my UI work on the Druid, and just play on the others.