I want to mention my favorite tool for creating a computer which can boot into different operating systems:

It's called Xosl.

The only other multiboot tools out there that I've been able to find are text based systems. There's the standard microsoft tool, and then there is something linux afficiandos call "Grub."

Apparently the original author of the tool, Guert Vos, isn't anywhere to be found these days, but XOSL is still a great thing. The only update I really would like to see is for it to support NTFS partition labels. It's difficult to see which partition is which without labels.

A word to the wise: Don't try to install a second operating system on your computer without knowing exactly what you're doing. You need some background knowledge about what a "master boot record" is, and what a "partition boot record" is - and you have to know how the computer boots up.

Dan Goodell gives a great overview of how to set up several different versions of microsoft software here.

There's a uk organisation which has mapped out all the quirks about multibooting with Vista, here.

To get linux to boot, I simply have xosl pointed to a partition where the grub bootloader is installed.