"Automatic, electronic submission of your iTunes LP or Extra is scheduled for the first quarter of 2010."
Cue, the Apple iPad! Although missing from Steve's presentation, it seems obvious that music publishers will be offering lots more iTunes LPs by the time the iPad is released (at least that's what Apple is preparing for based on the above comment). It provides music publishers with extra revenue for music and video. And it provides Apple with another media segment to be sold to eager consumers (like me) using their hardware. Apple has control of the whole ecosystem: selling hardware, developing the format, selling the media. A hard act to follow by media companies, although at one point in time Sony was probably one of the few global companies to be able to offer a similar ecosystem of hardware, movies, music and games. But by now it may be a little too late. All they can do is try to catch up.
Flux 2, a web development IDE for the Mac, comes with an iTunes LP and iTunes Extra template to get you started!
Of course you can do all this with a website. But the iTunes LP offers something to distribute, use offline. It might be just one more trick up your sleeve.