Launched last year in November as Google Local Mobile, the map service was enhanced and got a new name. If you go to www.google.com/gmm on your mobile phone, you can try Google Maps Mobile: get directions, find local businesses, view maps and satellite imagery.
The list of supported mobile phones is very big and includes: color BlackBerry devices, Nokia 6230i, Nokia 6600, Samsung SGH series, Sony Ericsson K750i, Sony Ericsson P900. Google Maps Mobile is a Java midlet that connects to Internet and displays maps as JPEG images.
If you want to test drive Google Maps Mobile, go to this page (requires Java) and try the interactive demo.
Related:
Google Maps for the rest of the world