APP Wanted - GPS mileage tracker

[Liamfm]

Okay,
So I may be dreaming here, and I'm not one for computer programing (at all), so if I'm crazy tell me.

I'm wondering if there is a way to do the following:

Create a program that, when selected (press 'start') begins to track your mileage via the GPS. When you hit "stop" it stops and asks you for a title. It then stores the title and mileage in an excel sheet for retrival later. Something like:

1/22/09 Trip to Staples 5.6mi


Basically, I end up driving around a lot for work, and they are all short trips. I'd love to have an application that keeps track of the mileage automatically so I can export the excel sheet to my companies expense report.

Anyone? Does it already exist?

Thanks!