This idea is great! From any web browser or from your mobile phone, you can "flag" any place in the world. This tools uses Google maps so you get either a map or a satellite view or an hybrid view. You can actually map all your favorite places. You can add a comment to each place you flag and share your places with friends and family, or even anyone. So when you went on a trip, or to a good restaurant, or any other place you want to share, just map them with flagr.
Try it, it's free:
http://www.flagr.com/