All the presos at the HPC Consortium were run off the speaker's personal laptops. The days when presos were done using "foils", transparencies, or slides, are over. And there's a good mix of laptops. Certainly lots of Macbooks running Mac OSX. Also Solaris running on x86 laptops. And, of course, Windows. 

These days, the author presentations are loaded from the author's laptop to a 1GB flash memory "thumb" drive, to be later published on the internet. No paper.

The guy sitting next to me is runing Ubuntu Linux on his Fujitsu laptop. Another is running Solaris on his Acer Ferrari (AMD64) laptop, like mine. And, there's a mobile wireless system in the room so we can also be on the internet.

Looks like the adoption of laptops as conference presentation media is finally complete. And, I should also add that all the presos used StarOffice/OpenOffice.