not really commercialization, but on Dragonfly TV (PBS Kids), they usually use the intro to Megadeth's "Peace Sells" when they're seging into something involving athletics.
Ugh. I can remember when that bass line was the theme song for MTV News with Kurt Loder.

Believe it or not, there are times when I think commercialization of a song is a good thing. If an artist is largely unknown (or even sometimes if he is), a well-made commercial can give great exposure.
Soul Coughing's excellent song "Super Bon Bon" appeared in a Heineken ad a few years ago. It would have been great except for the fact that the band broke up about three years prior to the commercial.