Planet Fallout is in the process of mapping Fallout 3 using Google Maps. Currently, 65 users have contributed to the site that now has 418 markers detailing where quests, items, easter eggs etc can be found, with all the functionality provided by Google Maps, including a zoom in/out feature. Contributers are being rewarded with points according to the importance of their findings and a high-score table has been included on the site. Check it out here.