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Google Maps has improved its directions feature dramatically today by adding "Click and Drag": after laying out a route, click and drag any point to have Google Maps recalculate the route with updated distance and time. It works great when you don't like the suggested route, want to take a detour or need to avoid traffic jams and the like.
Click and Drag is extremely smooth - it's one of those features that makes you wonder how you lived without it.