That's a great point. I certainly think applications should have the freedom to offer their own custom view of the user's data (as you point out, even hierarchi

That's a great point. I certainly think applications should have the freedom to offer their own custom view of the user's data (as you point out, even hierarchical views, if that makes sense in their context - for example, it makes sense for MP3 players, where there is a natural hierarchy along the lines of Band -> Album -> Song), but I also think Apple should show some leadership here, both on a UI level, as well as on a technical level (for synchronization, versioning and similar features).