We built github chat and it's in production http://kato.quora.com/Free-Kato-For-Open-GitHub-Repos please check it out and give us some feedback
Dev here! Yeah, we've been making www.trou.pe for while and have just added some github hooks after some user requests. We are just curious to see how far people want github integration to go...
This could be really important for bigger projects where new/significant features should be discussed openly. This way the information stays attached to the repo and others can refer to it later on.
Looking forward to seeing it in action!