If you have trouble finding where you parked, there’s an app – and a dongle – for that. The Find My Car Smarter device and an iPhone app (for iPhone 4S only) can mark where you parked your car and help you get back there. The Find My Car Smarter Bluetooth Smart device ($25, or $30 with car power adapter) plugs into your car’s cigarette lighter, and the app on your iPhone (works with 4S only) notices when it loses power when you turn off your car and marks the location. The Find My Car Smarter app ($0.99) can show you the location of your car, how far away from it you are, and how long you’ve been parked there. With Dropbox syncing, a group can share information about a communal car. You can also set automatic reminders for parking meters and street sweeping schedules.