Dan Fernandez has posted a Cheat Sheet which will help you get started with Beta 1 of Visual Studio 2010 and the .NET Framework 4.  I noticed that one of the links in his list is that of the Visual Studio 2010 and .NET Framework 4 Training Kit – May Preview.  The previous training kit was really useful as it provided a number of worked examples that highlighted new features of the product and framework. Microsoft have committed to update this training kit, saying that they will make it available for each beta/rc and the final rtm product to help developers skill up with the new features.