[JED3]

This couldn't be more true. If you haven't already, you should check out Ian Bicking's Silver Lining. Its not an immediate solution, but its certainly an exciting development in this space for Python.

http://cloudsilverlining.org/

[bmelton]

I haven't played with Silver Lining yet due to its infancy, but I personally considered the problem solved with virtualenv and fabric, though my deployments aren't exactly complicated anyway.