OMG Google maps now lets you drag the blue route line to customize your route!! Very cool use of Ajax - it updates the directions text as you drag the blue line on the map! And you can even move the start and end points with the mouse too. I love it!
Here is an example for those of you too lazy to type in your own map start and end points.
Ok I know this feature has been out for a few months but it is so cool I wanted to share it with others who might not have noticed it yet!