One of the things that's bugged me most about the iPhone is the music player. If you're like me and listen to podcasts or download music radio shows then you'll know what I mean. The pain point is the linear scroll function when trying to find a particular point in a piece of music/podcast. When you have a 2 hour show, trying to pinpoint the part you want to play on from is a nightmare. What I'd really like to see is someone develop a better music app for the iPhone, one that provided the same functionality as the iPod player (or improved on it) BUT that used the classic style scroll wheel for scrolling through a track which was way better. Now that's an app I'd pay good money for.