Geolocation Plus lets you geotag your posts, shows a map on the post page and serves a GeoRSS feed of all geotagged posts on your site.
The Geolocation Plus plugin allows WordPress users to geotag their posts using the Edit Post page or any geo-enabled WordPress mobile applications such as WordPress for iPhone, WordPress for Android, or WordPress for BlackBerry.
Visitors see a short description of the address either before, after, or at a custom location within the post. Hovering over the address reveals a map that displays the post's exact location.
It serves a GeoRSS feed of all geotagged posts on your site, allowing geo-aware RSS readers to display the location of your post or otherwise aggregate your geotagged content.