Google Maps on My Blackberry
I just installed Google Maps on my Blackberry today. It was actually very easy to install, and you jsut need to go to the following link, using the browser on your Blackberry, and install the application. It actually works really well, and you also get the satellite maps too.
http://www.google.com/gmm/index.html
You can also enter driving directions, and then just click the number 3 and on the key pad to move along the different legs of the driving directions. Of course, you still need to kind of know where you are since it does not have GPS, but it could be very handy.
It is also available for the Treo and Windows mobile phones too.