With this application you can create, edit, share, and view personalized maps on your Android powered phone synchronized with the My Maps tab on Google Maps. It supports full editing functionality for markers, lines, and shapes, plus the ability to mark your location using GPS or attach a photo...
Let's move this country... — Works as advertised but is lacking some of the features of the webapp. Edit the maps you have stored at Google Maps. You can even first use My Tracks to track a journey and afterwards edit it with My Maps Editor.