I’d actually thought up this technology myself and described the possibilities to my wife. The next step would be to have GPS in the phone so location recording was automatic. I’d want my phone to give me advice on best driving routes based on day of week and times. It would also be nice to know if it was a weekend and you happened to be in the same part of town as your friends.
(I’d like it so it would remind me to call/text my wife! -John)