Does anyone remember an application that uses the information gathered by tools like this to predict where a user will be at any given time? I'm not sure I unde

Does anyone remember an application that uses the information gathered by tools like this to predict where a user will be at any given time? I'm not sure I understand the difference between that concept and what this does? If no-one has actually built it, then I'm really disappointed as it's quite simple - and I would be pretty easy to locate too. We're all creatures of habit.