One of the cleverest things to appear recently is TomTom's IQ feature. It takes the fm traffic updates every 15 minutes & offers to reroute where there's trouble ahead. Also, it actually knows how fast you can drive on every road at every time (they buy the data from mobile phone providers). Without it, you just spend all day sitting in the same traffic jams caused by everyone using the same route... Way ahead of the competition for route planning, according to my mate who just bought one!