A few weeks ago I wrote about the October update to the training kit for Visual Studio 2010 and .Net 4. Soon afterwards though, updates came out for the Windows 7 training kit and then at PDC the training kits for Windows Azure and security.
Training kits are a collection of presentations, hands on labs, and demos related to the new features in a release. Here's that set of training kits from above along with a quick summary of what they cover. If you previously downloaded the October training kit for .Net 4, then that one hasn't changed since the post above.
Visual Studio 2010 and .NET Framework 4 Training Kit - October Preview
Identity Developer Training Kit (PDC 2009)
Windows 7 Training Kit For Developers