I was playing around with the WCF REST Starter Kit CodePlex Preview 1 package and had some problems getting the Visual Studio 2008 templates installed correctly. Someone suggested running MSIEXEC with elevated permissions, but in the end I did the following:

1. Run the setup, let the add-in installer crash closing any debug requests and such.
2. Open the installation directory, such as C:\Program Files (x86)\WCF REST Starter Kit\Visual Studio Templates Installer.
3. Double-click on RESTStarterKit.vsi and follow the instructions.

I still haven’t got the item templates to show up as expected. I noticed they got installed under Documents\Visual Studio 2008\Templates\ItemTemplates\Visual Web Developer instead of Visual C#, but moving them didn’t fix the issue.