I'm working to setup a new site with WP 2.1 and bbPress 0.75 So far the integration has worked very well and I've primarily been tweaking the themes.
Anyway, one weird thing I've noticed is if I include a link in a post (std a href="") and submit it, the href attribute is stripped out completely. All that is left in the post when I edit it again is the link text surrounded by empty a tags (tried to use & lt ; in my post and it got converted to tags - wild)
I plan to dig through the code a bit and see what might be causing this. I'm not using any plugins beyond the standard WP integration on. It's a fairly stock install.