Google Latitude can help you keep track of friends and family on your cell phone. Find your buds and their status on a map, then contact them with a call, IM or SMS. You have to have a compatible phone with images enabled such as Android-powered cellies, BlackBerrys, Nokia smartphones and Java-enabled devices. If you have an iPhone or iPod, there are plans in the works for those, too. Google promises privacy but you might want to think about how much you want your friends to know about where you go and when. This is a free service but carrier charges may apply.