I put XP Pro on three systems, including my laptop. There was a lot of preparation involved, and when the dust cleared, they all worked just fine. That was in November. Since then we have refined things, updated drivers and cleaned up dead wood, and the result is three very happy computers. There are some frustrating times in the network area, but that is because of XP Pro's security, and we're learning to live with it.
There are some system enhancers I would not be without . . . Tweak.ui for XP, and Microangelo for total icon control in XP.