Just looking at Blogger's
draft features. The geotagging feature which links up with Google Maps "mostly" works. For whatever reason it would not return a full address search. I had to search by zipcode then drag my "balloon" to the approximate the location. Would be cooler if the link created a small pop-up showing a mini-map. Right now the add-on just provides a link in new window.
edit: Oh, wait, it does create a mini-map for any posts you geotag...(to the right of this page). I had to enter my blog url first.
edit2: On second look, it is working then not working...hmm..keeps losing the location.
Other services are implementing a similar feature:
You can tag and map images on Flickr. Like I did
here.
Twitpic also has a map feature as part of its Twitter pic share feature that updates a Google world map.