Want to protect your valuables but don't feel like carrying around a key or remembering a combination? Make has a guide for building a Raspberry Pi-powered system that unlocks itself with face recognition.
The system uses a Raspberry Pi and camera to handle the face recognition, and then a servo lock the box. The end result is a simple little lockbox that you'll unlock with your face. It's obviously not enough to make it a safe place for all your valuables, but the system could certainly be modified into a more secure box. Head over to Make for the full details on making it for yourself.