Microsoft has released ACT 5.5 (Application Compatibility Toolkit). ACT 5.5 provides support for pre-RTM version of Windows7.
To learn more about ACT 5.5 I recommend reading “Windows 7 Application Compatibility Toolkit 5.5: Interview with Jeremy Chapman”.
ACT 5.5. can be downloaded here
Another great information source is the Application Compatibility and User Account Control site on Microsoft TechNet.
And finally I came across the blog from Chris Jackson -the App Compat Guy” that is worth a visit as well.