Google Maps and Birding

Google Maps now has a feature called "My Maps." With this feature, you can mark locations on a map, add photos, write captions, and draw lines/circles/etc. You can then share a link to the map with anyone. I think this has a lot of potential for birding. It could be used to show the exact location of a rare bird or to create a map of great birding spots in your area. Just a few ideas... I'm sure there are many more great uses. As an example, here's a link to every baseball park in the US.

http://maps.google.com/maps/ms?ie=UTF8&msa=0&msid=103763259662194171141.000001114c8ae7cac9869&hl=en&z=4&ll=36.738884,-96.767578&spn=34.132809,59.238281&om=1