It does "delay" the incoming sound via microphone by 10 seconds. This gap between the scenery you are currently looking at and the sound you here may give you strange feeling of passing time. You'll find yourself a bit more conscious about the ambient sound in our daily life.Yes, it's Japanese, in case you were wondering. And free.
This list is in no way definitive. If you've spotted a great app that hit the store this week, give us a heads up or, better yet, your firsthand impressions in the comments. And for even more apps: see our previous weekly roundups here, and check out our original iPhone App Review Marathon. Have a good weekend everybody. Related: Gizmodo's Essential Iphone Apps