I'm sure Web Wiz Guide will hop on the ASP.Net boat one day, but in this point in time ASP is a lot more popular than ASP.net.
Mart is right, www.communityserver.org probally has the best forum if you can handle all the other crap they throw in with it. Or, you can
download the forum by itself. It's an old link, so I'm willing to bet there's a newer version out there. But the download still works!
If you're willing to pay money, then check out the
Instant ASP forum. Prices are between $119 and $5000, depending on what version of the forum that you want.
Is there a reason why you don't want to use this classic ASP forum? It's faster, more secure, and better overall than pretty much any forum you'll find out there. And it's free too!
[Edit: Clarified something.]
Edited by thataintchicken - 12 February 2006 at 3:43pm