I just wanted to share this with the forum. Every month or so , Mercedes-Benz release a web-based Mix Tape. You can listen to the tracks online, but it is designed for you to download the tracks and make a Mix Tape for, obviously, driving with. All of the tracks are by lesser-known artists, as this is very good exposure for them.
Alternate URL: http://www.mixed-tape.com
Thanks to JayISGames for this link.