Someone used to operate their android phone while they are walking or on the move, they will love this app named “Transparent Screen” which recently hit on the market. Using this cool app your cell phones display becomes “transparent”, enabling to view what’s in front of you while your eyes is busy at Smartphone’s screen. It generally use your cell phone’s back camera and overlays it on top of your phone screen transparently. A very effective concept, though its uses a lot of battery power – I think it’s up to you to choose whether it’s valuable or not.
It’s free version is available in android market and also pro-version (no ads for $1).