How many times have we all driven ourselves crazy trying to think of the name of a song we're hearing?  Well, iPhone users despair no more - download the Shazam app!  With Shazam, you can click "Tag" and the app will take a sample of the music you're hearing, send it to it's database, and return the song's info (unless, of course, it's unrecognizable).  The results it displays includes the song name and artist, along with lots more:  links to buy it, share on Facebook and Twitter, send a postcard, YouTube videos, etc.  The app is free, but there are also premium versions that let you launch a Pandora or last.fm station from your Tag results.

We've used the app while doing things like shopping in stores and waiting for a table in a restaurant, most of the time with songs correctly identified.   Songs from less well known artists and smaller labels do have a greater chance of not being identified, simply due to a greater chance of not being in the database.