Just today Nvidia has released a WHQL Candidate driver, which is almost a final version for WHQL instead of a plain beta. According the Nvidia, there are numerous fixes and changes, but mainly concerning SLI and Windows Vista x64 issues.

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• Nvidia ForceWare Drivers 169.02
• Nvidia ForceWare Drivers 163.75 WHQL
• Nvidia ForceWare Drivers 175.16 WHQL
• Nvidia ForceWare Drivers 169.25 Beta
• Nvidia ForceWare Drivers 178.13 WHQL