I've long been frustrated by the awkward design of Google's personalized May Maps. The service feels crude, and I'm unsure how long the data will stay around.
Today I decided to try and learn a bit more. I recommend the introductory video (a very young sounding narrator) and I really recommend "Browse the directory". Turns out that's not, as I'd imagined, a directory of maps (why should it be?). It's a directory of Map tools that make "My Maps" much more useful.
I'd like to see what I can do in terms of Minneapolis St Paul trails, and maybe get some use of the msptrails.org domain I registered a while back.
Update: Well, I gave it a good try, but it's still a toy. For example, there's no way to edit a map you've created; you can't revise or extend a line. I'll wait until Google puts a bit more energy into this one.