Using the GPS Features on Cell Phones?

Rylor asks: "A couple of years ago I bought the Samsung 300NP cell phone, which has a GPS feature that I can turn on or off. The primary purpose is to meet the Emergency 911 calling requirements laid out by the FCC. I've checked the manual several times and it only says that I can use the GPS feature for anything service I want, but that's it. Sprint doesn't offer anything else about it. So my question to Slashdot: if you have a cellphone with this feature, what cool ways are you using it?"