As a designer/developer who owns and operates a successful UBB forum, I've managed to talk two clients into using them in the last year. Here are the sites I've built from scratch:
My Pride and Joy:
hr-man.com Client Sites:
kceaintouch.com This one launched this
week.
TNASSP (this guy hasn't promoted his bb at all - oh well)
The Corner Deli (no ubb - but developed in ASP)
My Other Sites:
Knoxlife.com 476 Design (my company - no ubb)
WebStrong Media(partnership with brother - no ubb)
Digital Portraiture(TM) (recent development in my life - portrait artist - go figure).