Welcome to BlackBerryForums.
I like Google Maps, pretty cool to see an estimation of where you are.
There's alot of other applications you can add.
Another one for me is Ramble IM because it's free and it doesn't use text, it uses data.
Invisible Shield (scratch proof)
Tekkeon portable power (battery immortality)
Wi-Ex cell bar booster
BoxWave holster clip, car mount and retractable USB cable
The Macallan single-malt Scotch (neat, please)