So I had to document how I got YAF to integrate with a couple of sites that had existing ASP.NET membership databases, and I thought I'd share.

I am too lazy to blog or whatever so it's in PDF format. Here is a link to the document:

YetAnotherForum.NET Membership Integration With Existing Web Sites Using the ASP.NET SQL Server Providers 

Hope this helps someone because it took a lot of trial & error for me to get this to work.

EDITED: to correct the link

http://ewitch.net/docs/YAFMembershipIntegration.pdf 

Thank you so much for correcting that link - my apache configuration is all screwed up and I've had no time to fix it, so my subdomains aren't working. I'm probably going to convert it to HTML at some point.