Bringrr
How many more times will you get in your car and drive off, leaving your cell phone at home or back on your office desk? If you've got a Bringrr in your car, the answer is "Never!" It seeks the bluetooth signal in your phone and sounds an alarm if you start your car without the phone being present. Simple and clever. The new Bringrr Charge model also has a universal USB charger built in. $39.95 at Bringrr.com