it sounds like heaps of people are trying to do very similar things.. just this week I've been hacking on a rails engine/plugin that lets you define your models

it sounds like heaps of people are trying to do very similar things.. just this week I've been hacking on a rails engine/plugin that lets you define your models with mongo_mapper and then request them as json schema. It's not quite complete but json schema gives you interfaces for your restful apis..