Get GRUB, it's pretty.
*had a quaruple boot working for a while*
Win98 SE
Win2000 (I think)
RedHat 7.1 (mighta been 7.2)
FreeBSD 4.3 (I think)
Or was it 3? I installed a few OS's, then went for one more and my computer died. I think I ****ed-up the stuff in the boot-sector some when I went for the final one.
Anyway, now I run Win98 SE and RedHat 7.2 under GRUB, coz it's pwetty and easy to use.
Just install everything oldest to newest then run the RedHat installer. I'm reasonably sure you can install GRUB on its own, and it'll auto-thingy to have all the OS's selectable on boot-up, and it's a piece of piss to change the default boot-up OS.