The Windows 7 Blog page has just made mention of two new tools available pertaining to Windows 7 migration. These tools comprise the Windows 7 Upgrade Advisor and Compatibility Center which together will give you enough information for you to feel comfortable making the transition without any issues.
The Windows 7 Upgrade Advisor scans your PC to see if it's ready for Windows 7. It checks to see if your PC meets the system requirements, lets you know if your processor is capable of running 64-bit versions of Windows 7 and gives guidance on your upgrade options. It also tells you about any known compatibility issues with the most commonly installed software programs and devices connected to your PC. If an issue can be resolved, it suggests next steps for you to take before installing Windows 7.
The Windows 7 Compatibility Center helps you easily check the compatibility of thousands of devices and software programs for 32-bit or 64-bit versions of Windows 7. Usually, you won't need to do anything to ensure compatibility. If you do, the site goes beyond just telling you what will or will not work. It also provides links to drivers and software updates to help get your PC running with the latest software.