Youtube user KDG86 has made quite a few interesting projects. This Wireless GPS Project is nice and simple but have lots of cool possibilities. He is using a GPS module that outputs RS-232, this signal is connected to a wireless transmitter. A receiver is then used to get the data into a computer. Since it is RS-232 all you need is a terminal program to have a look. He then takes some of the raw data and with one copy and paste his exact location is zoomed into by Google Earth.
Instead of a computer I would feed it into a microcontroller and have it warn me when I am coming close to one of the red light cameras that seem to be everywhere where I live.
http://hackedgadgets.com/2008/04/22/wireless-gps-project/