"This version of Google Maps for mobile even has a few tricks not yet available on the desktop version of Google Maps. For instance, you can find the last transit trips of the day (to figure out how late you can stay at the party) and more easily browse through earlier or later trips," suggests Google Mobile blog.
You can download the latest version of the mobile Google Maps for Blackberry and Java-enabled phones by visiting www.google.com/gmm on your mobile phone or by following the instructions from Google's site.