You don’t need to add a geotag to your site or blog. At the moment it is an interesting sidenote more than something practical. However, I can see it evolving and growing as we begin to use the Internet for more than just online socializing. There is offline socializing too, after all. People have been using geotagging on their photos more than on their site itself. One thing to consider is privacy. I would not give out the exact latitude and longitude to your house itself, settle for the town you live in rather than going for an exact location.
Find your location information (latitude and longitude included) at:
Add your geo meta tags to your blog.
About.com: Web Design: What is Geotagging?
Problogger: Geoblogging – How to Geotag your Blog.
Linux Journal: Geotagging Web Pages and RSS Feeds
The Open Geospatial Consortium “is a non-profit, international, voluntary consensus standards organization that is leading the development of standards for geospatial and location based services.”