SharePoint 2010 Foundation Business Connectivity Services The new SharePoint WSS (SharePoint 2010 Foundation) includes the new version of the Business Data Catalog, Business Connectivity Services! Previously BDC functionality was only available to MOSS 2007 Enterprise customers so this may open up lots of opportunities!
Windows Server AppFabric Building and deploying applications more easily on IIS using AppFabric
VS2010 Instrumentation and Profiling VS2010 profiling now includes SQL queries executed! Nice! You can also integrate data from remote machines running the load agent.
TFS 2010 Gated Check-In You can test your build without checking in
TFS 2010 licensing model MSDN premium subscribers get TFS 2010 (and not the workgroup 5 user edition!)