These are just great and birders everywhere should be digging them in a big way. They can be so useful whether it is in Atlas work, sharing locations with other birders via blog or email. If you haven't found them already then just click on the maps icon on Google homepage and play around. After you have amazed yourself by virtually dropping in to you own back garden, you can begin to create maps that relate to the species seen.
See what I did here on Bird North East involving first records of Wheatear & Sand Martin.