Let's end the week with a little music (part 2). We're sorry, Shazam, we loved your amazing music ID feature before, but that's before Midomi stole our heart.
Midomi, available here, can do what Shazam does (quickly listen to and identify any song playing), but it does so much more. You can sing or hum to Midomi and it will still identify the song. You can speak or type a line from the song.
The only downside is that you have to remember to bookmark your finds, because Midomi doesn't automatically make a list of tagged songs, as Shazam does. Still, it's the far more useful song identification app, and it's got a permanent place on our iPhone.