Dino Chiesa, who previously wrote about how not to write a REST app, finally spills his guts on how to go about doing so. The basic metaphor in WCF is that services receive and respond to incoming communication, and clients initiate those communications. The REST service is an application that receives and understands HTTP GET Requests according to the REST pattern. He notes that although these can be built using any text editor, Visual Studio makes it a lot easier to code, test, and debug. He also talks about how LINQ complements REST approaches.

http://blogs.msdn.com/dotnetinterop/archive/2008/03/20/how-to-build-a-rest-app-in-net-with-wcf.aspx