I am just testing this beta version of LiveTracker for BlackBerry which does not support Twitter. The program picks connects to the BlackBerry's GPS, picks up the current location and sends it to a server. Buddies, friends or bosses can then see my current location on the web using a desktop or BlackBerry browser:
I can now also update my Twitter status with the GPS location link with one click:
Don't want to make too much advertisement for this here. I just like the app, so if someone here wants to check it: it is free
LiveTracker Free Beta Download