Topic: seamless intergration into wordpress site, punbb rules the school
the punbb forum: http://www.gypsyspacemuffin.com/forum/index.php
the associated main site: http://www.gypsyspacemuffin.com
I dl'd punbb, installed, edited the css, bam, done, took less than an hour. It doesn't get any easier.
I'll be sending everyone who asks about a good, easy to use and set up forum to punbb.