@Ebb, Shadow: After considering for a bit, I'll allow playtest and ToB characters, with the caveat that if anything proves to be way out of line or completely broken, I get access to the nerf bat. (I haven't heard much about playtest classes yet, but I've heard that White Raven Tactics can be a bit strong.)
I think tonight sometime I'll toss up a character thread for everyone to post their characters to, so it's a bit more organized.