I will second that.... I've just used the Advanced Forum module after importing data from a PHPBB2 forum and it worked a treat... it's similar to these UC forums and userpoints are juicelike as well.

Only drawback I've found is that it doest (yet - as at June 2008) support importing from phpbb3

it's only a personal website so theming is very basic but you can have a look at the (daft) forums here http://www.blueridge-scaffolding.com