Register with Google Places
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If you have a Joomla website that targets a local audience, like a shoe shop in your home town, registering your site with Google Local is a great way to put your site high up in the rankings for shoe shops locally. You have a great chance of showing up on a result page with a marker on a Google Maps image, like this example for Iphone stores in New York:
Though it is not Joomla specific, it is a great way to promote your site.