I've been playing around with the Google App Engine for the past few weeks. I threw a simple Django app [http://c-o-l-o-r.net/] up there to test out how the deployment tools worked and found them to be really nice. And if it were a popular app the usage reporting tools look like they'd be just as cool.
Brad Fitzpatrick just announced he and a few other Perl hackers are using their 20% Google time to create a Perl version of the GAE with no promises from the GAE team that it will be included. But if you're a Perl hacker looking for a project to contribute to, that seems like a really good one.