Google has just released Google Map service for the Treos.

Treo 600,650,700p are supported, but I suggest all other PalmOS (OS5+) devices with network connection should work.

The service itself is FREE, but you will need network connection to get GoogleMap for Treo work, like GPRS (which normally cost), BT PPP var desktop etc.

This seems to be the first release so it is not very rich in function, but I am really look forward like support for *.KML (POI and Path) from the GoogleEarth desktop, sending POI data to GoogleMap for location display, or even sending GPS data realtime to it for Tracking…

Heads up Google and install now!
🙂
Link:
Google – Take the power of Google Maps with you on your Treo.
Google – Supported devices
Official Google Blog – Maps in the Palm in your hand