The Intel based Mac really opened up some doors that may not have been supposed to be opened. Installing a rival operating system on a Mac? No way. However, because the system is Intel based, this is possible and it works fairly well. Because of the size of the Mini, the company I work for deployed a Intel based Mac Mini as a Kiosk system located outside of our main facility.
Although you may scrounge your own collection of drivers if you so desire, there is a package already out there that has all of the drivers you need for the Intel based Mac Mini. Why recreate the wheel?
The above link details the installation process quite well. In addition the Mac Mini Windows XP drivers are located at the above link.