Updates (Score 1)

Like other people have said it's becuase vista is coming out. But for a different reason, windows media player 11, internet explorer 7, WinFS and other such technologies are planning to be backported to to xp. However, seeing as most of these "features" arn't even compleate on Vista maybe 2007 is MS way to say "when it's finished and working and we have had 6 months to try and switch people over to Vista, then XP can be updated".