Whiteboard Free [iTunes link] - Another interesting use of the Bluetooth peer-to-peer function. You connect with another iPhone/iPod Touch and both devices will be able to draw on the same whiteboard. The $.99 version gives you different color markers.
Snore Patrol [iTunes link] - For those women whose husbands snore loudly but flatly deny that they do. This free app records your husband's snoring for later playback. You have to be awake to record - it does not record automatically. There's a really funny audio meter with a woman's face that changes as the snoring gets louder.