I wrote it primarily because I was tired of having to fire up iTunes and/or a web browser just to see how my latest run went. It doesn’t do much for now, it just rummages through the workout data stored on your iPod Nano by the Nike+ chip and summarizes it for you. It’s more proof-of-concept than OMGWTFBBQ right now. If I have time to maintain it, I’ll add in a bunch of stuff I wish the Nike+ site itself had.
It should, in theory, work on a Mac. But, as I don’t have a Mac to test with, I can’t guarantee that.