I don't know how this project is doing, but it may ease the worry about reliance on Google infrastructure if they can keep it going:
"AppScale is a platform that allows users to deploy and host their own Google App Engine applications. It executes automatically over Amazon EC2 and Eucalyptus as well as Xen and KVM. It has been developed and is maintained by the RACELab at UC Santa Barbara. It supports both the Python and Java Google App Engine platforms."
"AppScale is a platform that allows users to deploy and host their own Google App Engine applications. It executes automatically over Amazon EC2 and Eucalyptus as well as Xen and KVM. It has been developed and is maintained by the RACELab at UC Santa Barbara. It supports both the Python and Java Google App Engine platforms."
http://code.google.com/p/appscale/