Download the .exe and run it to install two programs:
SlideSpeech - play wiki-based scripts using the voice selected in Windows Control Panel. Copy/paste the address of a script into the input area. For example: http://code.google.com/p/wiki-to-speech/wiki/HiKim
SlideSpeech Converter - utility to convert an open document presentation (ODP) or PowerPoint (PPT) file into a script, a zip file, a slideshow with voice over and a video using the voice selected in Windows Control Panel.