While services like Gowalla and Foursquare still haven’t become household names outside of the early adopter market yet, the technology behind these apps is now solidly mainstream. According to a new survey by the Mobile Marketing Association (MMA), about two thirds of iPhone owners now user location services at least once a week. Taking all cell phone users into account, 22% of adults between 25 and 34 use location services at least once a week, mostly to locate nearby points of interests, shops and services. – from ReadWriteWeb