The wiki section has useful material, but it's pretty hidden. I would suggest putting a 'wiki' link in the header used on all the pages (e.g. alongside "Download", "Forum", "API Reference", etc.) Otherwise I don't even know how to get to it from the main site, I have to search on Google.
Speaking of searching on Google, it looks like bulletphysics.com and continuousphysics.com both point to the same server. As someone with a bit of web admin under my belt, I'd suggest picking one as the "main" site, and then configure separate VirtualHost entries and have the "unused" one do a 301/permanent redirect to the "real" one. This is all pretty easy to do with Apache, and will combine your search engine rankings instead of having it split across two different domain names.