I'm not sure if you guys heard, but the 3DS recently launched in the United States. I know what you're thinking, didn't Nintendo just launch the DSi, or the XL DSi? You're absolutely correct. However, this new DS is in 3D, hence the name!
I wouldn't call this a feature, but the new 3DS has the ability to recognize a face and create a Mii based on a photograph.
Naturally, I tested this out. Apparently, my face can be so frightening that I spooked the poor 3DS. My scary face is unrecognizable!
Thank you, 3DS for making me feel fugly and inadequate. :D