Geotagging is the process of adding geographical identification metadata to various media such as websites, blogs, or images. This data usually consists of latitude and longitude coordinates, though it can also include altitude and place names.
For example you can Geotag your flickr-images. Explore posted images by location: http://flickr.com/map
Or Geotag your Blog. Here is a step by step guide. Using FeedMap (Blogs + Maps) you can Geotag your blog, browse already geo-coded blogs and search for blogs. Once geo-coded, you can get your own BlogMap location using a simple url that allows you to network with your local bloggers. - Pretty cool stuff.
My coordinates (Lat-Long) are: 47.38 (47°22') 7.994 (7°59')