From Sparkfun, a $100 prize if you can decrypt the serial output from a commercial laser tape measure so it can be possibly hacked into a sensor useful for robots:
"This tutorial, "Laser Tape Measure Hacking," comes from SparkFun CEO Nate Seidle (aka, El Queso Grande). Nate was intrigued by the idea that if he could hack a laser tape measure, it could be used in autonomous vehicles, 3D scanning, or any number of other applications. So Nate set out to hack the device. Unfortunately, he wasn't able to wrangle the serial controls and hit a wall. That's where you come in."