Read a rave review written by this editor who puts forward the device that he claims transforms the PDA industry.

Provides an detailed display of this product's features, in particular, its springboard expansion capabilities.

Explore GPS, digital camera and modem modules for the Handspring Visor, with reviews containing ratings for design and usability.

Introduction to Handspring's line of PDAs includes modem, memory, and multimedia add-on specifications, plus software and third-party reviews.

Learn about this personal organizer which provides a plug-and-play slot for hardware and software upgrades.

PDA touts a special slot for plug-and-play ware that, according to this PC Magazine editor, gives the competition a run for their money.