Try out Stackato (http://www.activestate.com/stackato) [note: I work for ActiveState]. It's a commercial fork of Cloud Foundry that adds a lot more functionality. You can download an image for your hypervisor of choice (vSphere, fusion, vbox, ...), or provision one on EC2 or HP CS (no download necessary).
ActiveState is the Python community lead for Cloud Foundry (we added and maintain the support), but Stackato is much more than wrapping CF. It improves security (all user code is staged and run in linux containers), adds much more flexibility (hooks at staging or runtime, cron support, etc.), better manageability (web based console, user/group management), persistent file system, and more.
Also, if you like extensibility, a new experimental feature in 1.2 is Heroku buildpack support. Basically you get Heroku-in-a-box.
ActiveState is the Python community lead for Cloud Foundry (we added and maintain the support), but Stackato is much more than wrapping CF. It improves security (all user code is staged and run in linux containers), adds much more flexibility (hooks at staging or runtime, cron support, etc.), better manageability (web based console, user/group management), persistent file system, and more.
Also, if you like extensibility, a new experimental feature in 1.2 is Heroku buildpack support. Basically you get Heroku-in-a-box.