Slightly off-topic, but I've been hacking IndexedDB lately, and while I'm grateful to Mozilla from saving us a future of writing SQL in the browser, IndexedDB is not what I would call friendly. Anything you do against it requires 4 or 5 callbacks. The first thing a JavaScript programmer will do is write an abstraction layer around it. That's a sign an API is too complex. Why on earth a transaction is required to do a get (or even a put, for that matter) is something I don't understand.