I use it all the time at work. I LOVE google maps on my droid, especially since they show both state road numbers and road names. That's important to me for work. Used the pinpoint application a couple days ago to email a map and my coordinates for the helicopter who was enroute to assist us...
In addition, I use it to text other co-workers on shift so that we can coordinate things we don't want to speak over the radio. I've made a bunch of spreadsheets with important information on them such as court dates etc.
I can use it to look for warrants and all kinds of stuff. Use easymoney 1.2.3 to balance my bank accounts... Used Flixter a few times looking for the best theater to go to...Use weatherbug all the time...Used the camera a few times for evidence pictures...use it as my alarm clock, to browse facebook, to check account balances with my bank...
oh yeah, and to make and receive phone calls