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
It depends on your scenarios, but you'll find that WCF REST gets in your way quite a bit to enable certain scenarios.
The starter kit starts to fix some of those issues, others will be fixed with the next version, but if you want things link creation, content type negotiation and custom media types, you're going to be spending a lot of time making it work.
There are other frameworks out there that solve the same problem in a more straightforward fashion, I suggest you have a look at OpenRasta and Snooze, or even MVC.