12. Non-USB iPhone-to-car connection
Getting high-quality audio in your car is never an easy or cheap task, especially so when you're hooking up your iPhone to your stereo. That said, until Apple launches an iCar (which could easily happen), your best bet is to opt for a USB connection, which will deliver stronger results than an aux or bluetooth connection.
Until we get turntables for our cars (probably shouldn't happen), it's a reasonably not-too-disappointing way to avoid bland radio station programming. Even if you like classic rock, you can only listen to "Hotel California" so many times.