I think that EC2 will become a defacto standard given time, if nothing more than because of its rich API. Already there is Eucalyptus, an API-compatible open so

I think that EC2 will become a defacto standard given time, if nothing more than because of its rich API. Already there is Eucalyptus, an API-compatible open source cloud implementation. Others are likely to follow. Ubuntu has already made their cloud tools support generic, around this API. That's half the battle.