So developing an aspect of ARJWright's reply, one use case could be the interaction with the Car's IVI of the calendar app. The interaction could be cloud-based eg a Google-Calendar sync system, or it could be a direct sync PC <--wifi/3G--> Mobile <--bluetooth--> IVI <--3G--> PC. In this scenario an extra field or two would have be added for tasks which require travelling to. Once the location of the task is entered, a mode of transport field would appear, where the user can specify one or more modes of transport for this particular task.

As the task nears certain reminders and/or tasks could be triggered in the calendar. e.g. for that meeting that requires a train journey, a task to book tickets could appear a couple of days before the date of travel to ensure cheaper Advanced Fares are paid. In this scenario the user is driving to the train station. The system has been monitoring the TMC output for the last week and has noticed the general congestion on the route to the station, and so sets the daily alarm 20 minutes earlier to compensate (by now the system knows how long it usually takes for the user to get ready for work). When the alarm rings it gives a reminder of what time it would be best to leave the house. The train station happens to be on the route the user takes every fortnight to his mother's house so the IVI brings up the route but leaves the voice off until the junction for the station car park approaches. As the train nears the required stop (calculated using Cell Tower data & the time), the phone alerts the user. On alighting the train at the destination the personal navigation system on the phone is triggered with the 10 minute walk to the meeting highlighted.

The system could all be coordinated from the Home PC (or maybe the MeeGo set-top box) which will have to be running all day with its radio tuner to allow for the TMC component to work.

The obvious privacy issues with this kind of system that have already been exposed in the iphone and TomTom would have to be addressed.

This just helps cover the user's travel needs, but a whole intelligent PDA system could be developed that could create a real disruption.