Google have just announced the Google Maps Navigation (Beta) which now has the ability to automatically route you around traffic. With more than 35 million miles driven by Navigation users every day - this should save quite a few people, quite a lot of time.
There's nothing extra a Navigation user has to do, just enter in your destination and instead of Navigation automatically choosing the route that was fastest (without taking current traffic conditions into account), Navigation will now use Google's routing algorithms to current and historical traffic to select the fastest route from those alternates.
This not only saves time but also fuel, as well as the fact that you're making traffic better for everyone else as you're avoiding the traffic jams. Currently Google Maps Navigation for Android (with the updated real-time traffic conditions) is only available in North America and Europe at the moment.