I have herd a little talk about the MSN Games GDK lately, and what wondering what Rapid was.
It sounds like some sort of testing environment, is this true? How can I get access to it? Or find out more about it?
From some old (2006/2007) presentation on MSN Games...
To get access to the developer libs you'll need to submit a concept, have it approved and then take it from there. (I've not actually done any of this so can't advise you on the process itself).