The Google LatLong blog and Google Operating System have announced a new feature in Google Maps that allows editing the locations of address markers on the map. They can be moved now! So if looking up your address points to a spot halfway down the block, you can fix it now. (Google Account required.)
Changes of more than 200 meters will need to be reviewed before going live (how do you tell what 200 m is on the map screen?), but for changes smaller than that, they’ll appear immediately, complete with a history of changes and an option to revert to the original. Sounds cool! I’m off to fix my house’s mark.