I am using InDesign for my yearbook this year, but I have to say, when I want to do something in the classroom quick and dirty, I rely on PM because I know it so well.
When I have the time, I create docs in InDesign just because I want to get used to working in it.
Unfortunately, none of my yearbook schools have made the switch. That means I am stuck using XP. I just bought a new HP a1600n with duo core Athlon +3800, so XP is running pretty fast, and I may be happy using it it until my customers catch up. That may be a while as most of my schools that I work with are poorer ones on SW Ohio that are luck just to have computers.
Daniel