If you haven't had the chance to check out channel 9, you're missing out.
Our team has put out two videos since the launch of beta 2; I highly recommend you take a look at them when you get a chance. In this screencast, running just under 9 minutes, I give a brief overview of the new profiling capabilities coming to Visual Studio 2010. If you have about 45 minutes free, make sure to take a look at the team interview where members of my team dive deeply into parallel performance profiling advancments.
For a really nice overview, read John Robbins' Blog describing the concurrency visualizer in VS2010.
James Rapp - Parallel Computing Platform