Something promising that i read up on recently was the concept of Near Field Communication. Essentially near field communication or NFC for short, consists of a close-range radio chip that is in your phone or other personal electronic devices and it will allow you to access different devices or rooms based on the settings. The current interesting use is for turning your cell phone into a key for a hotel, or a key-card lock. Personally I would love to just walk up to my house or hotel room and put my phone in front of the door which would allow me to access my room. Consolidating everything into one would be a great accomplishment.
This could also be potentially used for a variety of things. It wouldn’t necessarily have to be put into a cell phone but it could be in other devices as well. Maybe a car key or something of that nature. The nice thing is that they can be reprogrammed for anything.
If you lose your device, your access can easily be revoked through the management system. It is currently being pioneered in Sweden by a lock maker company Assa Abloy.
I think this is pretty neat and would love to see it in action.