impressive was formerly known as KeyJnote.
Impressive is a great tool to present PDF presentations to an audience using nice transition effects. It is ideal for everyone who creates a good looking presentation using advanced techniques like LaTeX (beamer class) as it combines good looking PDFs with the refreshing transitions of a tool like MS Powerpoint.
To install impressive simply enter:
sudo aptitude install impressive
Command line parameters: http://impressive.sourceforge.net/manual.php#cli
Keyboard commands: http://impressive.sourceforge.net/manual.php#usage
To start displaying the file presentation.pdf with the transitions SlideLeft and PagePeel:
impressive -t SlideLeft,PagePeel presentation.pdf