Perf Tools for WPF (.NET 4)
You can now download the perf tools for WPF in .NET4. These tools can be use for profiling both 3.5 and 4.0 applications.
The tools come as part of the Windows SDK for Windows 7 and .NET Framework 4 (Windows SDK 7.1) download.
If you havent yet tried it, please do so. The install also deploys a chm file which documents the tool usage