About Boot Camp 2.1 for Windows
Leopard is the world’s most advanced operating system. So advanced, it even lets you run Windows if there’s a PC application you need to use. Just get a copy of Windows and start up Boot Camp, now included with Leopard. Setup is simple and straightforward — just as you’d expect with a Mac.

What’s New in this Version
- This update addresses issues and improves compatibility with Microsoft Windows XP and Microsoft Windows Vista running on a Mac computer using Boot Camp. It is highly recommended for all Boot Camp users.

Important: Installation of Boot Camp 2.1 is required before installing Windows XP Service Pack 3 (SP3)

For more information, please visit this website: http://www.apple.com/support/bootcamp/