I just installed an extension that makes it easy to bookmark BP content with social bookmarking tools like (my personal favorite) del.icio.us, furl.net, and digg.com. The extension also has support for these. If any of you use them, let me know and I'll enable them:
It also supports Technorati, IceRocket, and PubSub, which are slightly different sorts of things and probably not as useful for most folks. But let me know.