Hi there,
I'm using bbPress as well. I love the forum for its ease of use, SEO friendliness & sitemap support, and of course, the support of one of the largest blog/ CMS communities out there - Wordpress.
I've gotten the forum pretty much fined tuned to my liking, with one exception. I can't seem to set images (via the Allow Images plugin) to have a max width. In other words, when users post an image, and it's larger than 500px or so, it will overflow and break my layout.
FYI - I'm also using the bbCode buttons and bbCode lite plugins - so that's how users add images - by using the IMG tag button.
So, is there any way to set a max-width restriction on the images, or have them resize automatically if they're too large?