But sensing trouble, I decided to give it a shot early.
Turns out OpenOffice for the Mac sucks. There's no native build, only an X11 version, and probably as a result the fonts totally suck. I'd be embarassed to project those ugly glyphs onto a wall. (OpenOffice 1.1 on Debian is totally beautiful, though...)
So my next thought was: OpenOffice can export as PowerPoint. Maybe I'll find a free OS X PowerPoint viewer somewhere on www.microsoft.com. No such luck. (does one exist?) But I didn't happen to catch something pretty ridiculous: Microsoft Office is $400! Damn. You can buy a whole computer for that.
At this point I'll keep using OpenOffice and hope to find another computer to use, or just bring a little Shuttle system with me. Oh shit, I realize now they probably provide a computer to use. Phew. But I'll keep this rant.