John Gruber at the Daring Fireball wrote a very well thought-out argument for Apple to extend their newly announced Boot Camp into a Classic like environment in the upcoming OS X 10.5 (aka Leopard). That is to say, rather than having to reboot your machine into Windows XP (or Vista), you’ll instead just double-click your Windows apps in OS X and they’ll run like OS 9 apps have under Classic since the original OS 10.0.
Of course, he goes into details on how this would benefit Apple but he is just simply a better writer or at the very least has more time to articulate himself. Give it a read.