Google Maps for PDA

Google Map now supports PDA's (in particular the Palm Treo with these features...

Real-time traffic — See where the congestion is, and estimate delays. (USA only)

Detailed directions — Whether you plan to walk or drive, your route is displayed on the map itself, together with step-by-step directions.

Integrated search results — Local business locations and contact information appear all in one place, integrated on your map.

Easily movable maps — Interactive, draggable maps lets you zoom in or out, and move in all directions so you can orient yourself visually.

Satellite imagery — Get a bird's eye view of your desired location.

http://www.google.com/gmm/treo to download the PRC and Hotsync

source: Google Alerts

other links: Palm Wiki

update: Google Maps Mania has more