[mel_llaguno]

Actually, I was considering using GWT over the AppEngine. It provides a lot of supported functionality (such as fast Image serving, OAuth & OpenID, BLOBStore, Memcache) that seem a bit of a pain to integrate with ROR. Those features in conjunction with the free quota limitations (for approximately 5 million page views per month) make it seem like an ideal low investment platform that can scale one demand. I'm just wondering if anyone chose ROR/Django over GAE and what their reasoning might be.

[nl]

Well RoR has got good libraries for image manipulation, OAuth (note that AppEngine doesn't have OAuth built in), OpenID and Memcache.

Blobstore really only exists to work around the lack of file access in AppEngine.

The pricing is something of an advantage, but don't choose it on that alone. If you know Java (or Python) already then it's worth using, but it's probably not going to give you enough of an advantage to switch platform.