We have many iPhone apps dedicated to store your bright ideas. But theis the most convenient one. Of course, the precondition is, you need a chalk.
In fact, iBlackBoard is not a real product. Kalomix, a design studio from Hong Kong came up with the wonderfulcombined with modern technology and traditional tool. From the images, apparently the case is painted with black chalkboard paint so that we can use a common chalk to write down some important things on the exterior of the case. After the break, check out the demo video.
Unfortunately, this is only a design concept. Even if you need, the fun iPhone 4 case is unavailable at present. By the way, perhaps someone can design a matching iBrush iPhone 4 case. Sound good!