It's worth keeping an eye on this as well: "Vertebra: A Next Generation Cloud Computing/Automation Framework" http://brainspl.at/articles/2008/06/02/introducing-vertebra
There hasn't yet been a "first generation cloud computing automation framework", so it's kind of impossible to be building the "next generation". That first generation is pretty much what everybody in the field is working on (including my company). But Vertebra sounds like an interesting approach for the applications where it fits. And repurposing an existing protocol for RPC is always interesting, they've chosen the…
Also Vertebra is not just for server automation, it is a framework for distributed computation of many kinds as well as a real time application platform.
The discovery mechanism and Resource based dispatch will allow for applications to get a request, discover via a Vertebra call which backend is least loaded and offers the request processing you need and then dispatching said request to the proper backend. Also allowing for map/reduce and scatter/gather style programming.
I have many ideas of where to take this thing and I cannot wait to get it out in the open so I can see what other folks do with it.