The Z Object Database is a robust object store that has been used for over a decade to persist the state of Python objects. The ZODB Webscale project aims to make the ZODB usable from within the modern web browser environment.
That's right. Key-value pairs stored by the browser. Think of it like Mongo but better.
Sure. Use Firebug to check what's being sent over the wire and the contents of the window.localStorage, if you doubt us.