I really like the project-- thanks for writing it!
Two things to suggest for the web site documentation.
First, you may want to suggest (in several places) to use the tests as examples. The examples you have were a bit too terse for my use, but the tests provided enlightenment.
Second, when doing a save/get on a double-linked object, you may want to suggest the use of decycle and retrocycle in Crockford's JSON-js cycle.js. Without cycle.js, stringify fails with a circular link message. I was going down some painful blind alleys to solve my issue, and this was a very clean solution. You may even want to have a test for it to show the solution.