I'll be replacing my almost 5yr.old G3 iBook with a new Macbook in the next couple weeks. I'm a college teacher, school starts end of Aug., & the iBook died. In asking advice on the hardware buying forum, an issue came up that is more appropriate here. Is Powerpoint problematic on the Intel Macbooks? Would it be advisable to purchase a copy of Keynote when I make my purchase from the Apple Store? I often make my powerpoint slides available to my students, so compatibility with Powerpoint for the Windows users is an issue also. Thanks in advance for you opinions!