Draggable Routes in Google Maps

The guys a Google have come through again.  Google Maps now lets you drag driving directions around to add custom waypoints on the route, without having to manually enter their address or lat/long.  Aside from being really neat to play with, it lets you easily map a custom route (say, for my morning commute) without having to do a whole bunch of futzing.  This pretty much trumps any custom route plotting stuff I've seen, and linking support will be enabled in my bicycle reporting dashboard shortly.