While cassette tapes may be obsolete, some of us still have cars that have cassette players, and that's exactly why the iDeck Car Cassette Adapter for iPods was created.
The cassette inserts right into you cassette player (just like that old Michael Jackson tape) without the need for a cable. I'm a little surprised things like these are made, but hey, some of us are only up to speed on our iPod game, not our car game.
Ancient Music Adaptors
More Stats +/-
Future Festival & Malcolm Gladwell - Early Bird Deadline
Top 30 iPod Innovations
iClassic iPod Dock
GelaSkins for the iPod
In-Ear Bluetooth Headphones