This hint solves a long standing problem when playing classical music on an iPhone. When using the iPhone Music app (iOS 5.1), the full entry (e.g. name of artist, album or song title) for an item can be too long to be displayed. Tap and hold entry to see the full entry pop up. Tap and drag your finger down the list to make the pop up change as you drag. This works for album titles, song titles, and artists names.
[kirkmc adds: Nice. I hadn't heard of this before, but searching the web shows that it is not totally unknown. Since it hasn't shown up here before, it's worth posting.]
Mac OS X Hints