Doc Searls wrote up a bit on getting the most out of those little FM transmitters that get the noise out of an iPod and into the car stereo. I am quite satisfied with my Griffin iTrip, but there is certainly some useful information here, including a link to a clear definition of the inverse square law.
Hmm, inverse square law… Funny, I was just reading something in Scientific American, a theory about cosmic acceleration being caused by the leakage of gravity into extra dimensions, and that mentioned the inverse square law. Or more exactly, the author hypothesized that gravity over long (cosmic) distances obeys not an inverse square law but an inverse cube law, spreading out over three dimensions.
Things that make you go hmmm.