RSSCloud or not -- I do happen to think that we need a push RSS solution -- what really bugs me is the fact that once again, we're inventing different standards to do the exact same thing. As if ATOM vs RSS wasn't enough, now we have RSSCloud + PubsubHubbub to worry about. PSHB already has Google behind it (all of Feedburner feeds support it), so I really fail to see what wordpress won by adopting RSSCloud.

Besides, while Dave is a brilliant guy, PSHB already has a lot more people working on it with open source hub and client implementations (heck, I wrote one for Ruby!).