As part of the MySpace session at MIX they've put online the code for a sample called RESTchess. RESTchess is a WCF REST application that mimics a lot of the developments behind the WCF implementation of the MySpace developer API. If you're interested in getting details, then Vittorio Bertocci has a more extensive description of RESTchess. If you're just interested in poking at the code, then the link above is all you need to get started together with the MIX session videos I posted earlier.