SYNC combines the often separate phone and music-player functions into one unified interface that can be controlled by a voice-recognition system that works well. You can command it by voice to play a single song out of 1000s on your iPod or other music player. With some phones, it will even read your incoming text messages to you, and properly pronounce text-message shortcuts such as LOL
cue BSOD jokes. but seriously, ford and microsoft? crappy separately, i shudder to think what the love child is like.