I had forgotten about this site, they did an incredible job programming it. Facinating to compare:
http://www.forummatrix.org/compare/bbPress+miniBB+phpBB+SMF+vBulletin
(I picked those top five but you can choose from like 25 others)
But I can easily spot some missing things from the bbpress chart that have been added in the core or via plugin, so they need an update...