Turn any daily activity — getting coffee, shopping for clothes, drinking with friends — into a game by checking in to earn points and badges (oh, and to let your friends know where you are). That, along with the check-in deals and Yelp-type reviews, make Foursquare worth checking out. Or, rather, checking in.
WIRED Facebook and Twitter integration. Can create to-do lists of places you want to visit.
TIRED Crash-prone when using GPS. Real-life rewards for points and mayorships are few and far between.
