Google added a new features that let you save, annotate, and share directions using My Maps, the personal map editor built into Google Maps — just click the "Save to My Maps" link below the directions in the left pane. This opens a dialogue box to save to an existing map, or create a new one. Once saved, you'll be taken into My Maps editor, where you can edit saved placemarks, route, as well as add new places and details to your map.
Also a new tool lets you draw lines along a road to get from point to point. This is accessed via a drop-down menu in the line tool by clicking and holding briefly anywhere on the button. The tool calculates the best driving route between your line's vertices and automatically snaps your line to the appropriate road.