[pilom]

I do something similar with whitewatermap.com. The problem with what you are trying (which I have run into too) is that the javascript can only access either AJAX calls on your own server (which I know you don't want to do) or access items via a url. S3 allows you to make things accessible at known URL's but it costs a lot per PUT request (relatively) so it makes databases difficult. If you find a cloud/hosted database that makes all entities accessible via URL I would be very interested too.

Edit: aespinoza pointed me to mongohq.com which does exactly what I wanted. I'm so happy.