Making sense of Google's user created "My Maps"

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.