We are looking at switching from using WCF for our service layer in applications to REST.
So far we are assuming that the way to do this is to use the WCF REST Start
WCF provides support for REST-style services since the release of .Net Framework 3.5, and you can start building REST services on WCF today.
The WCF REST Starter Kit is intended as a vehicle for the team to get feedback from the community on new feature ideas around REST in WCF. We are actively working on incorporating developers' favorite starter kit features in the .Net Framework - for example you can use the help page feature in the recently released .Net 4 Beta 1 release. As we get feedback on starter kit features we consider them for inclusion in the framework, which you can use in production.
Regarding the comments that the starter kit is "dead in the water", I can assure you it's quite to the contrary. We aim for a 4-month development cycle on new versions of the starter kit, as we have stated on the starter kit homepage. We have resources dedicated to supporting the starter kit and working on future versions.