If you meet the desktop software requirements and don't use animation in your slides, the Presenter-to-Go module from Margi Systems is a great way to ditch the laptop when you go make that next presentation.  I would sooner trust the Visor for showing a presentation than a Windows computer, and as easy as the PtG is to use, why not?  Handspring even used the Presenter-to-Go when introducing the Visor Edge at a press conference.

Update: Margi Systems has now released a Windows 2000 conduit for the PtG module.

Update 6/12/01: Margi Systems has released Mac OS drivers for the PtG module, as well as a Mirror application that lets users project any Visor screen. See the company's website for the most recent version of the desktop software.

Criteria  Rating Usability 4 Setup 3 Features 3 Cost/Benefit 4 Overall (not an average)	Pros - Easy operation - Great use of the Visor's Ir Port - Can display any Visor screen
	Cons - Stored presentations aren't available unless VGA cable is connected - VGA connector is tricky to remove