iphoto rocks!
My iPhoto get very slow after having lots of photos. Then I gave up on it.
macbook here! love the speed of the intel processors and the beautiful screen.. gone are the days of pesky viruses, crashy windows and the long and slow defragging process.
I think "crashy" is too much, it's like it crashes every day or every week. My XP has been quite stable so far, though it crashes occassionally but far from "crashy". OS X, on the other side, is definitely stable and rarely should I see one hang.