Pharos was displaying their relatively new GPS enabled PDA at CES 2008: Pharos 535. They have two different versions of that model: 535e and 535+. The only difference is that Pharos 535+ comes with navigation software already installed:

Featuring Ostia, Pharos’ award-winning GPS software and location-based services and preloaded with the entire U.S. and Canadian street maps. The Traveler GPS 535+ uses GPS satellites and digital street maps

to show you where you are, locate points of interest such as hotels, banks, restaurants or WiFi hotspots, or locate an address in your Outlook Contacts. choose your destination, and Pharos Traveler GPS 535+ will calculate the most efficient route and supply clear guidance with voice, text and graphic prompts.

Pharos 535+ is $434, and Pharos 535e is $310 on Amazon.

Original post by Dave Rubert