Haven't tried this one yet. But, it is always good to see a multi-platform Open Source app written in Python (I used to write a lot of small utilities in Python before I switched to Ruby). KeyJnote 0.10.0 isn't a PowerPoint or OpenOffice.org presentation creation replacement. It takes the output from presentations in PDF format (they recommend Xpdf) and adds features such as highlight boxes and spotlights to the presentation.