This driver has OpenGL support for Geforce 6, 7 and 8 series and has DirectX 10 support for Geforce 8800 GPUs. It also has support for DirectX 9 with Geforce 6, 7 and 8 series of cards.
DirectX 9 and OpenGL drivers for SLI and the family stone will be available tomorrow. A DirectX 10 driver supporting Geforce 8800 cards and DirectX 10 in SLI mode will be available sometime in "the future".
Nvidia points out there's a heap of unfinished things in this driver, so you'd better stay tuned for new releases as this one looks too patched for our taste. Obviously Microsoft has ensured this "launch" is very well coordinated with the hardware and fabless chip folk.
You can read all about it here and this is the place where you can download the 32 bit version. If you dare. µ