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
If your looking for some additional features (Like content type & accept header based de/serialization, per operation authentication, etc) check out the WCF REST Contrib project:
http://wcfrestcontrib.codeplex.com/
It is based on the 3.5 SP1 WCF REST API and offers some functionality not found in the RSK.