Over the weekend, Nvidia moved their 163.71 drivers into WHQL and now has them available for download. The drivers are definitely worth the download if you are playing newer games, such as BioShock or the Hellgate: London beta.
These drivers aren't incredibly new, having been available for a bit over a week as a non-WHQL package, but if you are still using an older series now's the time to update. They fixed a few SLI bugs with this release, such as the 7300 and 7600 series not functioning in SLI mode on Windows XP.