Windows 8 will soon be here and if you're planning on upgrading to the latest OS and have a NVIDIA card, you can
get WQHL drivers and be ready for a solid graphical experience. The drivers are version 306.97 and as I type this, I got a notice in my notification tray that these drivers are now available for download.
With WHQL drivers, they go through a certification process that makes them the most stable, but might not be the most feature rich as newer drivers maybe be out there from NVIDIA. You don't have to use WHQL drivers, but if you want only those types, NVIDIA's got you covered.