I use itunes in osx because I simply can't be bothered to find anything else which will play nicely with my Shuffle, but I'm not certain it's better than Windows Media Player, it's just different. And I really don't like how itunes insists on looking different to every single other program (what's wrong with the blue osx scrollbars?) or telling me the only way I can have album artwork is if I provide them with my debit card details. Er, no thanks.