On: EngineYard releases Solo: Inexpensive, web-based platform for Rails

Is there a way I can use this instead of a multi-slice conventional EngineYard setup? Or do you have a RightScale-type thing in the works?

We have ey-flex coming in a few months. Flex is the multi slice clustered version of engineyard on AWS, replicated db's autoscaling app servers and load balancing, message queueing plus logging and monitoring aggregation services.

So the answer is yes you will be able to replicate a traditional EY cluster setup on AWS in a few months.