Application Verifier 3.0 is available
Before I forget to mention it, we've just shipped Application Verifier 3.0 on the web. This tool previously shipped as part of the Application Compatibility Toolkit 3.0 but the new version has quite a number of new features to help track down hard to find bugs in unmanaged applications.
Since this is turning into a quick, links only blog entry, here are another couple:
Singularity, a Microsoft Research project which may be of interest to .NET programmers out there.