For no particular reason: the beat frequency between the LEDs on the CAN-enabled PICs blinking on my desk and the Ben Folds song "All U Can Eat" is ~0.06Hz.
I wonder how you make a program that can automatically detect the bpm of a song (for syncing with slideshows, for instance)? Low-pass it and look for regular spikes at bass drum frequencies? There's always the option of having someone tap on the spacebar in rhythm to the first 30 seconds of a song, then averaging the time between taps.
Okay, now I'm just procrastinating.