I dual boot Ubuntu and Windows XP, and with most programs I use, sharing configurations is no problems. My Firefox profile is the same, my Thunderbird email saves to the same place, and even Gaim uses the same preferences. The biggest problem that I am facing right now? No iTunes on Linux.
Since I got an iPod for my birthday, I've been using iTunes pretty extensively. I've been creating complex playlists, and rating all of my music. I just rate songs as I listen to them, which is easy enough, but when you add it all up, it's a big time investment. I'm willing to boot back into windows every so often to update my iPod, but I really want to have all my playlists and ratings available when I listen to music from linux.
The solution for me was to use a new music player called Songbird. It's an easy enough install to begin with, and some folks over at the Ubuntu Forums have written a script that automates everything. (I didn't use the script, but it seems to work well for others).
Then, follow these steps that I wrote out over at the Ubuntu forums. Hopefully this helps someone with a similar setup and a similar problem.