Google Maps has just introduced 2 useful things. The first is collaborative mapping in which you can jointly edit the same map with a selected group of users. The second is a kml import tool which allows you to import and export data to and from Google Earth. Sometimes Google Maps is a better option when you want to share a map widely and are mainly focused on point-data. I have been using it extensively for developing topical maps which highlight key geologic and scenic aspects of my study areas.
Note that the map below, though workable in the confines of the blog, is better viewed as a larger map (click the ‘view larger map’ at the bottom left).