You know, some apps show off how cool the iPhone is, apps like MachDice and Clinometer. But others simply show off how cool and clever developers are. iChalky is one, iSteam is another.

You will get bored of playing with iSteam quickly, but I doubt you’ll ever get bored of showing it off.

The premise is simple but very very well done by the guys at GreatApps. Your iPhone’s screen is steamed up and you can scribble on it with your finger. It even has realistic droplets of water that run down the screen. A squeaky sound of finger on glass is also included; however, I didn’t find that always worked and didn’t really sound right. A nice touch is you can fog the screen up again by blowing into the mic.

It also works on the iPod touch but you will have to use an external mic.

Currently it is free in the App Store and as such is a must have just to show off to those unfortunates who don’t possess an iPhone.