The Public Preview of the Release candidates for Microsoft Windows Vista SP1 is now publicly available.
Windows Vista Service Pack 1 RC Public Availability Program
Please note Autodesk is internally testing for compatibility with products at this time and no official support or result statements will be made until the upcoming service packs for Windows Vista are released in the final form.
Initial results from some using the Release Candidate say the performance is greatly improved and optimized CPU usage among other noted items. Pretty interesting deployment method using a script to edit the registry to flag your system on the next Windows Update to get the Windows Vista SP1 Release Candidate.