Thank you all for the replies. I didn't expect to start WWIII though.
Linux looks promising. Thanks for the heads up.
One thing I will say. XP works, It is familiar and easy to use. That is why most of us really don't want to get rid. As I said, I have a HTPC running Vista. It works but I really struggle to do anything with it as it so unfamiliar. I don't touch it unless the Media Centre starts to play up (rarely).