Good overview of application performance testing and management with Visual Studio 2008/2010
If you have ever been caught with performance problems you should watch this PDC 2008 session. If you have never had performance problems ... you should still watch the session because you may not know you already have a problem :-)
Improving .NET Application Performance and Scalability
You may also find this insight into the new CLR 4.0 profiling features.
CLR 4: Debugging and Profiling API Enhancements
