Hi,
Check out this Partition Boot Manager!!
http://www.sadevelopment.com/
I found this wonderful tool when I was on a mission to see how many operating systems I could get onto one computer.
I used PBM to load 76 operating systems onto one hard drive from ASP Linux to Yoper Linux and most everything in between like MS-DOS, XPPRO and WinNT4.
[edit: Actually, I had 63 systems on the first drive and 13 on the second drive which is also the data drive. ]
PBM has a neat way of hiding the partitions on the first drive so every system thinks that it is alone ( In the case of Windows, it thinks it is using the C: partition ). I used a second drive to store my data which is not hidden so that is available to any system that you are currently using.
Just thought that some peoples maybe interested in a really cool way of setting up multi boot systems. :)