I tripled boot the same three OSes two weeks ago ...
I did the following with my 30GB drive :
*8GB FAT32 for win98 and installed frist (made the other partitions with PM6)
*15GB NTFS for WIN2K (it is my main OS
)
* the rest for Linux ext2 format + 512MB for linux sawp
I installed the OSes in the same order, and used boot Magic as my booting manager .. and i installed the LILO on the same partition of Mandrake so it would not write itself over win2k boot manager ...
Oh boy .. still a LOT to learn about Mandrake for me (no time) i couldn't even play video CD or find my files on the other partitions .. but it is pleasant still ..
Regards and good luck ...