It seems like the iPhone implementation is better than I thought. I just had a bad audio file that was distorting the sound. It's still a little faster than the original iPod's speeded up setting, enough that you can tell it's speeded up, but it's not distorted.

Also, the iPhone doesn't like smartplaylists as much as the iPod did. On my iPod, I had a playlist of "unheard audiobooks" that items would disappear from as I listened to them. On the iPhone, they don't disappear until after a sync.

These are minor points. Don't get me wrong. The iPhone is the greatest piece of technology I have ever owned, and i love it. But I still like to comment on the issues that I find.