Niall Kennedy is leaving Microsoft to start his own business. Sounds like Niall got a little fed up waiting for Microsoft to follow through on promises that were made to him about resourcing a project he was passionate about. Big companies can do that, dammit.
Having heard some of his ideas (though he probably doesn't remember, I met Niall while I was in the bay area attending one of his tech sessions) I'm convinced MS has let an amazing opportunity go begging. I can't wait to see what Niall comes up with working for himself in a startup!
Good luck Niall!