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A couple of thoughts.
If the system is net connected (EDGE/HSDPA card, etc.) then you might want to support the ability to publish your current location in some fashion (IM, IRC, push to webpage, etc.) and to track the location of other users.
If net connected, being able to cross-link Google maps lookups against the nav database (search for something on Google, move the result to the nav side to get directions) would be handy.
3D route logging would be fun.
The ability to manually enter fuel fill volume in cases where fuel consumption information is not otherwise available would be good for mileage calculations.
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