Apparently, a PSP peripheral manufacturer called Neo has come up with a novel -- if somewhat useless (currently, at least) -- add-on for the handheld game system: a motion sensor. It's unclear right now what the possible uses for the sensor might be, and frankly, if it's something like an accelerometer, or a light sensor, or some other, cooler, more funky sensor we haven't thought of yet. There is one thing we can tell you for sure: it won't work on your PSP slim. Apparently, the device is aimed at home-brewers and DIY'ers -- and we're pretty sure they'll find something interesting to do with the thing. The company says it's available now, but we couldn't locate the little guy, or its price... so good luck.