Of all the many KickStarter projects I've written and read about, PebbleBee is the product I've been completely blown-away by and am sincerely considering investing in myself.
The simple description for PebbleBee is that it's an affordable "bluetooth personal tracking device tag." However, it's not's just the PebbleBee itself that makes it impressive, but the PebbleBee app that's built around this tiny tracking device. With the app, you can track your PebbleBee device within a range of 150 feet. You can customize range alerts so that when your PebbleBee moves past a certain point from you, you're immediately notified.
While parents and pet owners will love the fact that it provides peace of mind, I love it because it can save me from all the little inconveniences I deal with in life.