Use the Current DDK. Receive the Windows DDK as part of the beta release, or download from the web: http://www.microsoft.com/ddk/
Test to Ensure a Smooth Upgrade Path. Your test matrix should include upgrading your shipping client PC systems to Windows XP, which will help to identify constraints that might prevent a smooth transition for your customers.
Run Regular, Complete Testing Suites. Use the tools and guidelines from Microsoft to ensure that your testing suites exercise all the operating system features and functions used by your hardware and drivers. Run test tools on a regular basis to ensure drivers are free of errors.
Submit Bugs and Follow Up with Microsoft.Use the reporting mechanism defined in the beta package.