Vista is really killing microsoft right now. It's a matter of security winning out over freedom.
Mac's marketshare, I hear, has risen from 4-5 to about 8%. Not sure if that counts the sheer ubiquity of the ipod...Macs are easy to use and they have consistent interfaces. Windows has...windows. That's about it. But I don't want to start another poo storm mac vs. pc on this thread.