First official XP dual boot support. Now, even better, real Hypervisor-based virtualization is available.

This will remove the last big barrier to a broader OS X adoption: that one must-have Windows-only application that everyone seems to have. It is going to noticably erode Windows' marketshare. FUD and inertia in corporate IT will counter some of the erosion, but it won't stop it, especially in the home market.

And if Windows Vista sucks as hard as is suggested by early reports (not to mention badly-slipped release dates), it could all set the stage for a 'switcher' stampede over the next couple of yers.