I was very much hoping for something like this: http://news.ycombinator.com/item?id=1575928 and I'm really happy they chose to open source it rather than to let it rust on a shelf somewhere.
Agreed, it would have been a great shame to let all that work go to waste. I can't help but think that the protocol will really flourish once companies can self-host, and once the entire stack is available to tinker with.