I built http://www.sparkmuse.com http://www.sparkmuse.com and http://thesparkfoundry.com http://thesparkfoundry.com on AppEngine. You'll have to write a little

I built http://www.sparkmuse.com http://www.sparkmuse.com and http://thesparkfoundry.com http://thesparkfoundry.com on AppEngine. You'll have to write a little more code to handle not having a RDMS, but that's only if you need joins.