As for support, it works like this. Microsoft will support Windows XP under its mainstream support policy until April 14, 2009, and under its extended (fee-based) support policy until April 8, 2014. But everyone gets free security updates until the latter date.
There's still one last escape clause. For businesses that rely on Windows XP, they can buy Windows Vista Business or Windows Vista Ultimate, and still have the right to move back to Windows XP Professional via the infamous "downgrade rights."
Finally, the communiquÃ© states that "Every 10 PCs that switch to Windows Vista is the equivalent of taking an automobile off the road, in terms of greenhouse gases." I don't quite get that, but I do know this: I would not want to drive a car that runs on Windows. Would you?