To Psion's credit, this is a more durable platform for companies looking to put specialized software on handheld computers for their entire staff. There are already several engineering and medical applications available for it.
Vital Stats: Size: just 9.7 ounces with batteries. Memory: 2MB of RAM. Options: there are two slots behind swing-out panels for adding more memory, different applications, and a fax/modem.
Geek Factor: The Psion enables you to record your own sounds, and it includes a spell-checker.
Weak Factor: No stylus -- which means you must struggle with the tiny keys. Coordinates Psion Series 3c, $599. Psion Inc., 800-997-7466;
Power Tool: Pilot 5000
The bantam-weight Pilot is responsible for all the renewed interest in PDAs. Its major virtue is its simplicity. Don't look for large word-processing documents or spreadsheets on this machine. It includes only software applications that help you stay organized: , a basic appointment book, address book, To Do list, calculator, and memo pad, all of which are compatible with Windows applications. To transfer information, use the serial cable to connect the Pilot with your PC. The little PDA knows when its hooked up, and a hotswap feature makes transferring information and backing up files a snap.
Vital Stats: Size: 5.7 ounces -- it rides easily in a shirt pocket. Memory: 2MB of RAM. Batteries: a pair of AAAs keeps the Pilot running for about two months. Options: There's also a version that's Mac-compatible.
Geek Factor: It's the tiniest electronic organizer that works with your PC -- without complaining.
Weak Factor: Using Graffiti to enter text is like having to learn a new alphabet. I'd rather study Russian.
Coordinates: Pilot 5000, $299. U.S. Robotics Palm Computing Division, 800-881-7256; http://www.usr.com/palm