[Maro]

I like Keynote a lot and use it all the time for presentations, I think it's better than Powerpoint. Also, compatibility isn't that much of an issue here because I just present from my Macbook all the time.

But I prefer Word & Excel over the Apple/OpenOffice counterparts. Here compatibility also matters, as I routinely send Word & Excel files to lawyes, investors, etc. You don't want your files looking like crap with those guys =)