iTwinge, an iPhone sleeve that does the trick in the simplest of fashions: it merely covers the software keys with real, physical ones.
This is not a completely stupid idea, taking the many caveats into account (no landscape mode, hides contextual keys, prevents from selecting alternates and accents…). But what puzzles me is why such an accessory would need to take power from the iPhone’s battery.
Or are they just pretending to be powered so that you think it’s more high-tech than it actually is? I’m seriously considering the possibility.