What I know. Apple is selling PC Card as an option when you buy the iPod for $80. Apple has said you can convert the Windows iPod to a Mac iPod, and has instructions on how to do this, however, Apple doesn't mention or say how to go the other way. All firewire cards that are Windoze me, 2000, or XP certified will work according to Apple. You'll have to search for the conversion thing, it's something I read and don't need, you might start at
www.ipodlounge.com They have forums there too, lots of them all relating to the iPod with an Admin who's pretty active in them.