Try a search like this:

http://www.google.com/se....com+%22using+system%22

That turned up some examples.

We haven't published documentation the APIs yet though. The documentation would have been a bit tough to maintain as things changed a lot in the past two years. We've spent time with other stuff. So for now we just have this forum for you to ask questions, and we'll post examples. We'll probably get into better documentation soon as things have started to stabilize a bit more. You can always use .NET reflector to look at the ISessionManager interface, and you have the source code in your install to the Service.ashx HTTP JSON service.