Another PHP/MySQL board: phpBB2
The first version was good but nothing spectacular, the 2nd version which will be released in a few days is going to rock. It is Open Source so you get a nice and helpfull community and a great board for free.
------------------ -Dominik Dröscher ICQ: 25318265
"Quis custodiet ipsos custodes."
I always liked and used Snitz forums... it's free, asp and runs well. It's also easily mod-able to tailor to your specific needs. http://www.snitz.net/
You can see a working version by clicking here
Or for a full blown forum-based portal version of it look here.
Poke around the Snitz site for tons of info and other links to what people have done with it.