[ghshephard]

The new googles maps has traffic estimates, can show traffic, and it's pretty straightforward to even change your departure times (and show what the traffic will look like when you do).

It pops up when you query directions.

[redfalcon6]

What I'd actually likes as a feature is an output telling me WHEN to start my trip based on the lowest travel time due to traffic. Would be wonderful to have a histogram by hour for journey times based on traffic prediction.