Troy Tolle sent me a link to look at a new open source tool from UC Santa Barbara called Eucalyptus. This looks very promising for a much needed tool for managing Zen VM images across multiple host services. The point of the tool is to manage VM images in a cluster with the first implementation for Amazon EC2 but with the flexibility to support other interfaces it's going to give us more options over time.
The intriguing thing that strikes me is the potential to marry this with the many new cloud computing platforms coming online in the next few months. Competition in the cloud is going to help everyone get a better product.