I've decided that I will not be using Takahashi XUL for slides again. I really like Takahashi XUL. It's easy to use and I don't have to spend time learning a new bit of presentation software. That being said, I really have no control over the layout. It's the Takahashi way or nothing. However, the biggest drawback is that I cannot easily present my slides as a PDF.
I've downloaded OpenOffice Aqua for OS X. I'll try to learn the presentation software but after I get back home (I'm still in the Vienna airport) I'll upload a new tarball of the current slides and you'll be able to read them in Firefox.