[bergie]

1. Not really, but you can download and run it yourself. Online demo will come at some point later

2. We're passing JSON-LD (http://json-ld.org/) over the standard Backbone.sync API (http://documentcloud.github.com/backbone/#Sync). But for other systems that can be replaced with a different JS implementation to the fit the API conventions of the back-end you talk with. Just override Backbone.sync

If you're working on something similar, then our JS libs will probably be handy: https://github.com/bergie/VIE