All idioms are learned; good idioms are only learned once.

Display song lyrics on your iPhone by touching the cover art while the song is playing.

Which raises the question of how to populate lyrics data: use Needle Drop to cycle through songs in iTunes and Harmonic or GimmeSomeTune to retrieve and store the lyrics of the current song.

My complete list of iPhone usage tips is maintained in a TiddlyWiki.

Previously:
19 July: iPhone Newbie: ScreenShots and Lists
5 July: iPhone Newbie