Apple has released Boot Camp, which “provides a straightforward means of letting your [Intel-based] Mac run Windows.” According to MacMerc:
Boot Camp simplifies Windows installation on an Intel-based Mac by providing a simple graphical step-by-step assistant application to dynamically create a second partition on the hard drive for Windows, burn a CD with all the necessary Windows drivers, and install Windows from a Windows XP installation CD. After the installation is complete, users can choose to run either Mac OS X or Windows when they restart their computer.
Boot Camp has been released as a public beta and is available on a trial-basis for a limited time only. Apple plans to include Boot Camp as a feature in the next major release of Mac OS X.