There are dozens of programs out there. And these are some that I have used and mostly liked.
Mlipod for winamp
http://www.harrison-fisher.co.uk/mli....php?page=home
Anapod Explorer
http://www.redchairsoftware.com/anapod/
Xplay2
http://www.mediafour.com/products/xplay/
Mlipod is free and does the job although I still perfer iTunes more. As for the other 2 if I were to buy one I'd pick Xplay2. I just perfer the layout more, and for those people that have a mac and a windows computer it will work between both computers.