IRADAR (cobrairadar.com; $129)
WHAT IT IS: A tiny receiver that detects radar guns and alerts you via your iPhone.
HOW IT HELPS: By leveraging its GPS and internet access, your phone becomes a smarter detector. It can alert you to known smokey hangouts and traffic cameras, the locations of which are stored in an enormous and constantly updated online database. Alerts are displayed onscreen, offering a far more elegant fix than your shoe box–size device from 1995.