Apple today released Boot Camp Software Update 3.2 for Windows, bringing a number of bug fixes and support for several new hardware items.
This update adds support for the ATI-Radeon HD 5870 graphics card, Apple USB Ethernet Adapter, MacBook Air SuperDrive, and addresses critical bug fixes. This update is highly recommended for all Boot Camp 3.1 users.
If you have an Intel-based Mac and there's a PC application you need to use, you can run it using Boot Camp. You'll need to provide an authentic copy of Microsoft Windows but Boot Camp is included in Mac OS X Snow Leopard.