Back in the end of February 2006, Magnatune licensed music to Renault, which they were going to use to publicize their new car, the "Nouvelle Megane". The web site for this is now up, and the music available on the web site and the car.
What's the association between mp3s and a car? Well, this new model from Renault comes with a built in mp3 player, and they wanted to have an album's worth of music included with the car.
So, you can listen and download "L'Album Nouvelle Megane" from their web site, as well as listen to it when you get your car from Renault.
A nice perk, I hadn't expected, is that the Renault web site explicitly names Magnatune as the source of the music (not required with a paid license).
Renault has also licensed music for their "espace" line, a sort of SUV / Minivan, but I haven't been able to find where they've used the music on the web yet (sometimes, these projects take a long time)