I decided to post about this to help spread the word about this very cool, elegant an useful Python application. Its called KeyJnote.
In short, it is a presentation tool that displays your PDF presentation in a light, OpenGL accelerated, and full of eye candy way. Amazingly enough, it consists in a single Python script, and is available to all platforms Python supports, i.e., all imaginable. For lazy windows users that don't want to install the requirements, it is available as a single .exe file. I included a few screenshots to give you a flavor of it: