I performed this Windows installation specifically to use the VIA3 secure collaboration tool, which requires Windows 2000 or XP.
http://www.viack.com/product
The tool worked without problems using ordinary headphones, the built-in microphone (there is no external mic jack), and a Logitech QuickCam for Notebooks (USB).
However, the tool did not work with the built-in iSight camera.
In addition, the ability to run Windows will come in very handy for
- mobile application development
- web service development using Microsoft's free tools