Map My Run has launched a beta service that finally has full integration of a training log with their mapping software. It also integrates an elevation map and captures more data about your runs than the original version of Map My Run. I have been using their site almost exclusively for mapping as they have had a better interface than the GMap Pedometer, and most of the changes that they have made improve on that interface.
I’ll have a full review after I have had a week or two to play with all of the new features. I highly recommend checking it out in the mean time, though.