I moved my gaming clan's forum off ezboard back in 2001 or so when they started adding all the ads and popups. Used snitz for a while (ASP forums), invasion for a bit, and now phpbb for the last 6-8 months. I liked running snitz the best but they were slow to patch exploits. If I ever switched again, I'd buy vbulletin.
Hopefully the php issues on the server won't crop up again (My clan forum's broke too)! Most everything else we run is either asp (old stuff) or aspx.
Oh, just in case someone is curious the game I have a clan for is called ARC
www.arc-hq.net. Overhead view 2d team game, mostly 'capture the flag' maps. The net code is old and quirky, but its still fun =] As I recall it was a school project from the person/people that now do the PopCap stuff.