DVDShow for PowerPoint converts any PowerPoint presentation into a an MPEG movie file or lets you burn it to DVD so you can distribute it as a DVD and play it on a DVD player.
Using DVDShow for PowerPoint is quite simple. Just tell the program which presentation you want to convert, choose various options (such as the aspect ratio) you want to use, and it goes to work. First it previews the presentation for you, then it converts it and burns it. After that, you can distribute it to anyone you like.
The key question, though, is why would you want to convert a PowerPoint presentation to a movie file or DVD in the first place? If someone doesn't have the capability to view PowerPoint, that would be one reason.
It would have to be someone very special, though - such as your boss, your best customer, or your mum - because there's probably not a lot of need for DVDShow for PowerPoint, particularly given its $40 price tag.
The classic one-trick pony, DVDShow for PowerPoint is very good at what it does - but would you want to shell out more than twenty quid just to convert presentations to MPEG?