I am presently booting Win 98, Win XP, Linux - Knoppix, Mepis & Xandros on one machine and the same with a second but with Fedora C4 in place of Knoppix. This is without problems using the windows Boot.ini file. All these OS/Distros are blissfully unaware of each other and there is no cross interference.
I have detailed the procedure in a 2 page PDF file.
Download link: http://members.dodo.com.au/~nmj/download/multiboot.pdf