Although mostly crazy and a bit odd, this app is a great example of creative developers using the most advanced iPhone capabilities to produce a unique experience. We've all written messages on a steamy shower mirror or a window frosted with cool condensation. iSteam makes it possible to "steam up" your iPhone's screen and use your finger to create messages or drawings. What's more, you can use any photo as a background, then steam up the screen and write a special message.
The coolest thing about this app is that, if you're running it on an iPhone, you can steam up the screen by blowing on it (actually on the microphone). A particularly cool application for this capability is to write an invisible message to someone special on the non-steamy screen, and then ask him or her to breathe on your phone. Assuming they don't think you're crazy and move hastily away, the screen will fog and your message will appear right before their eyes.