Hi there!
I just started to experiment with bbPress and will integrate it into my family's blog installation which of course runs WordPress. :-)
While playing around with it, I noticed some missing labels on form controls. These missing associations cause screen readers to not pick up on the right stuff to speak when focus moves to a certain textbox, combobox or the like.
So, I went ahead and filed ticket #871 to deal with this and submitted a patch.
If you're interested in accessibility, I invite you to follow that trac ticket!
Marco