ISV’s, please check out this site. It will be the home of a readiness program supporting you in getting ready for Windows 7.
Windows 7 Ecosystem Readiness Program
Get access to Windows 7 builds, application testing labs and toolkits that can help you ensure that your existing applications and devices will be compatible with Windows 7.
If you haven’t done so already DOWNLOAD the Windows 7 Beta 1 bits asap as the beta program will be closed any day now.