Anybody else think line-in on the iPod should be an essential next step? I've known some other simply music players to do this with incredible digital sound quality. Shouldn't the iPod with huge hard drive be able to handle this no problem? As a musician this would be an invaluable feature for recording gigs and more. Hope someone at Apple hears my cry.... oh and it should be retro-fit so I don't have to go out and buy a new one. If the headphone jack can work to record with a mic, it must be an easy software matter to make it do line-in as well.