(Edit: I initially thought this was _from_ GitHub. Apparently it's not, so please disregard the nagging below. It is a cool idea, but if GitHub did this, I'd have different expectations.)

I'd be all over this if it was an IRC server. Most big projects already have an IRC channel on FreeNode, so this'd be a natural fit: Provide an IRC server with a channel for each project, provide a free web client for this server with the GitHub-goodies.

But alas, apparently it's just another proprietary chat network.