Brian a very good write up on availability in the cloud. We have put together a demonstartion of what we call persistent cloud services at HP. We front-end clouds with the continuously available HP NonStop system which can start, monitor, restart and scale (up and down) services across private & public clouds. Our demonstartion uses RightScale which allows us to cross cloud API boundaries in a friendly fashion. Let me know if you'd like more information or a demo. We work well together.