The updates to the Prism source outlined here, have been packaged as downloadable release on Codeplex.

This is largely the same code, with these additional items:

• Added the Quickstarts and Acceptance test projects back in.  These are the same as the ones available in version 2.1.
• A more complete test pass.
• A smoke test when targeting all projects to .Net 4.0

Additionally, we’ve posted the source to the ProjectLinker that can also work in VS2010.  We plan on shortly posting the ProjectLinker to the Visual Studio Gallery, to make it a bit easier to consume.