I don't think too many people will dispute the fact that location is buzz topic of 2010 so far within the online marketing industry. Big players in this space include Foursquare, Gowalla, Twitter, Facebook (soon), and of course Google. As reported earlier this week , Google noted that a third of its searches via the mobile web pertain to some aspect of the searcher's local environment, and that they think of location as a "hugely important signal".