A new version of the Windows Identity Framework SDK and developer training kit is available targeting Visual Studio 2010 and .Net 4. The Windows Identity Framework SDK includes samples and Visual Studio templates while the training kit includes hands-on labs and training resources.
The SDK and training kit each have a download option for .Net 3.5 and a download option for .Net 4. It looks like installing both versions of either the SDK or training kit does not work particularly well. The .Net 3.5 option is for use with Visual Studio 2008. The .Net 4 option is for use with Visual Studio 2010. Pick the option matching the framework and Visual Studio version you’ll be using. One exception is that the .Net 4 training kit includes Windows Azure resources targeted at .Net 3.5.