M.M.
Shazam! I know some will think that is lame, my husband does, but I love it. If you are listening to a song and don't know who did it or want the lyrics, you just Shazam it. Which means, click the Shazam button and the app listens to the song and loads a page that has anything you wanted to know about the song or artist, including tour dates and videos. I love it! I like my flashlight app too - it has come in handy more than I thought it would.
Now just ask about the lame apps that are available, I have deleted more than I have not :(