iOS 5 dropped today, which is fantastic, I guess—if you own an iPhone. However, if you're like me and, well, don't but still want the same bells and whistles on your phone, might I suggest the following?
Thanks to iOS 5, Foursquare has a new Radar feature in its iPhone app that's insanely cool. Radar will smartly let you know if you're near friends, around a place on your To-Do List or followed and will even notify you when the app is closed. It's like a super useful Find My Friends.