Whether or not its "worth it" depends on many factors. For example, my laptop has XP, because when I'm at the school network, I want it to easily switch over for Internet, and easily switch back at home, sch that its plug and play.
You've also got compatibility for NT 4, 2000, 98 and XP built in, so the legacy support is there.
If you're a home user that uses their beast for word processing and Internet mainly, however, and are content with 98, don't switch over. Unless you like patching aimlessly.
Just my 49.99
A+ Core Hardware, Software Certified (May 13 2005)
the new beast...
AMD Athlon XP 3200+ Barton running at 2.16 Ghz.
GeForce MX 4000 (mainly takes the load off the main system)
Creative Labs Audigy 24-bit sound.
Some Case from tigerdirect
512 MB Ultra DDR RAM.
80GB Seagate HDD
LiteOn CD-RW / DVD ROM drive.
currently looking at a litescribe drive at staples, due to its ability to label the CD shortly after being burned.