Apple has updated its Boot Camp software to support Windows 7.
Boot Camp 3.1 for 32-bit Windows and 64-bit Windows is recommended for all users of Boot Camp 3.0 and brings official support for the Apple wireless keyboard and Apple Magic Mouse.
Apple has also released the Boot Camp Utility for Windows 7 Upgrade, which safely unmounts the read-only Macintosh volume on Microsoft Windows Vista.
The utility must be used before upgrading from Vista to Windows 7.
Boot Camp: System requirements for Microsoft Windows 7
To use Boot Camp with with Windows 7, you need the following:
An Intel-based Mac
A Mac OS X v10.6 Snow Leopard installation disc. This can be either a Mac OS X disc included with a purchased copy, or a Mac OS X Install Disc 1 from a Mac that had Mac OS X v10.6 preinstalled
Boot Camp Update 3.1 (which can be downloaded from here)
A USB keyboard and mouse, or a built-in keyboard and trackpad.
Important: You should use the keyboard and mouse that shipped with your Mac, or a built-in trackpad.
At least 16 GB of free space on the disk you’re installing on for 32-bit, or 20 GB for 64-bit (for Microsoft Windows and Windows-based applications)
Boot Camp Assistant, which is installed by Snow Leopard in /Applications/Utilities/
You will also need one of the following Microsoft Windows discs:
An authentic, 32-bit Microsoft Windows 7 Home Premium, Professional, or Ultimate disc
With some computers you can use an authentic, 64-bit Microsoft Windows 7 Home Premium, Professional, or Ultimate disc