The Asus MyPal A636 is a PDA with a built-in GPS receiver that puts maps and directions on an equal footing with appointments and e-mail. While it delivers accurate directions and long battery life, it's a bit sluggish.

Onboard GPS ; louspeaker ; excellent battery life ; Windows Mobile 5 OS ; Bluetooth and Wi-Fi connectivity

Relatively thick and heavy ; 3.5-inch display too small for viewing driving directions ; bundled 256MB SD card hardly enough to hold maps

The reasonably priced Nokia 770 is a neat idea and a slick device, but slow performance and a few missing features keep it from realizing its potential.

The Nokia 770 boasts a gorgeous, high-resolution screen that makes stunning Web pages. It has a full-featured Web browser and an e-mail client, plus it supports Internet radio and RSS newsfeeds. The 770 is attractive, easy to use, and great at ...

The Nokia 770 suffers from extremely sluggish operation, with most movies and Flash animations too slow to be useful, and it relies only on Bluetooth and Wi-Fi for connectivity. Unfortunately, VoIP and instant-messaging features have not yet been ...

Aside from the lack of Wi-Fi connectivity, the QDA Oh! will make a handy and entertaining PDA-phone with its small size and strong multimedia features.

Lightweight and compact ; simple yet attractive design ; loud speakers ; crisp 262K-color display ; responsive buttons

No built-in FM radio ; no Wi-Fi ; mini-USB port available only via bundled adapter ; 2.5mm audio jack ; miniSD card slot

The iPaq hx2790 comes well-equipped as a PDA for business professionals, though the lack of a higher-resolution VGA display may be a gripe for some demanding users.

Fast processor ; integrated biometric fingerprint scanner ; Wi-Fi and Bluetooth connectivity ; offers both CF and SD/MMC expansion slots

QVGA screen ; a tad bulky ; no mini USB port ; no onboard camera