the thing i like about having an AUX-in is that i can probably save a bundle on the HU i'm buying -- it doesn't have to be MP3 capable, it just needs an HU. ung perang natipid, ipambili mo na lang ng matinong portable mp3 player. feel mo mag drive? hook it up to the HU. need to commute? put it in your pocket. corporate espionage? plug it into the usb port and run! :D