Google added a new layer to its own mapping application to show transit routes in the 400+ cities where it has data. The result is an easy way to see nearby bus and train stops on the web or on some mobile phones. Unfortunately, neither the data nor the imagery is available in the API version of Google Maps.
Microsoft has added waypoint optimization to the Bing Maps Routing API, which allows developers to create routes between driving locations. The API is ideal for delivery and transportation businesses, and the route optimization functionality is intended to address the traveling salesman problem.