I had a (spare) Sony with 98ME on it, and wanted to experiment with XP before I loaded it on my Dell. I guess I wasn't paying attention during the install, and ended up with two operating systems on the HD(98ME/XP).
Anyway, I couldn't be happier with the results. I can still use the old programs on the old system, and yet have the XP for multimedia. I was lucky the Sony had a 60Gig hard-drive, so there is enough for both to live side by side.
The downside, I registered XP on the Sony, so I will have to buy another copy of XP for the Dell if I go that route....