Once upon a time there was a really neat program for the Apple Mac. It played your music. It shuffled songs and albums. And it was called SoundJam.
Apple bought it - re-badged it - and iTunes was born. The rest, as they say, is History.
Or, more to the point, the rest is the Future of Computing for the next 10 years or so.
Because Apple have leveraged iTunes into the interface of choice for every form of content that you might want. Music, Film, TV, PodCasts, Lectures. You name it (er, "Books?" I hear you cry), and Apple have figured how to put it on your iPod. And as the iPod (and now the iPhone) has become the smart device of choice, so iTunes has become the interface that everyone uses.
And as everyone knows (and Sony learned) content is king.
But actually, that's changing. Because now the iPhone is actually a computer - it runs Apple's OS X operating system and is well on the way to functioning as a fully fledged laptop/tablet. And that means that, well, iTunes is growing into something more.
It's now the conduit for all the functionality you wanted.
Apple have had the TED (Technology, Entertainment and Design) triumvirate covered for a while. But now they have a hotline to every Form and Function you might possibly want.