Since the free 2003 Viewer will run from pretty much any media and doesn't need
to be installed to a PC first, you could just copy the necessary files to
whatever the U3 drive shows you as a disk and you should be good to go.
My problem is that I use addware Music Span with PP and want to run it
on different machines. When I tried to run it from a Flash drive on
another machine, it didn't played music added with Music Span. If I had
an U3 version of PowerPoint I think it would solve my problem.
I have PP2000.