Something to satisfy both the geek and the rockstar within:
Over at Music Machinery, Paul Lamere explains how he wrote a Python script that will analyze the waveform of a song and automatically detect whether or not the drummer used a click-track.
He then goes on to have some fun analyzing Green Day, Led Zeppelin, Britney Spears, and a friend's band. I could never explain the process myself so take a look. Oh, and speaking of music plus technology, why not process the click detector concept while enjoying Kuriman's YouTube inspired-and-created mashups on ThruYou.