I just downloaded it myself so I haven't yet tried it out, but Wildlife Acoustics has partnered with renowned birder and writer David Sibley to create a new birding app called Song Sleuth. Song Sleuth is like Shazam for birders. If you don't recognize a bird call you hear and want to know who it is you can plug into Song Sleuth and get it narrowed down to the three most likely birds it could be. It also comes with field guide information from David Sibley. This could be a break through for a lot of people who get frustrated with birding - unable to see who is singing around you now you can identify that bird with this new app.