WapAtlas Client is a location aware Java application which runs on many mobile phones which have built in GPS. It uses the phone's GPS capabilities and the phone's WAP browser to quickly and easily open maps showing the current location
TwitterGPS is a location-aware Twitter client which runs on GPS-enabled devices.
TwitterGPS enables Twitter users to exchange twitter messages (tweets) which contain information about their locations and then view these on maps - either on the phone or on a PC browser.
This Java MIDlet is easy to download, install and use