Social Bridging Post

Would love to see a blog post that summarizes where WPMU and Buddypress are as far as social bridging are concerned... maybe highlight plugins that are a best fit with the platform, as well as any tricks or work-arounds. I've noticed the chatter, but would be great to have a consolidated reference guide somewhere.

Also would love to see some type of ratings capability (thumbs up/stars/favorites). For events, the thumbs up/down can be switched to "im going/not going." And, of course, with ability for user to have ability to also share this in their facebook and twitter timelines.

Current wishlist:

Disqus (or similar) Integration
Content sharing to 3rd party sites in addition to posting to wire.
OpenID

Does this already exist? Am i missing something?

Many thanks.