If you are the paranoid sort who thinks everyone is watching you then a hidden camera detector is ideal for you. What this device does it helps you track down if someone has planted a wireless spy camera in your room. The unit is small enough to carry around and will warn you via a flashing LED light if a wireless camera is in range. You can also use the audible alarm too to warn you. The unit can detect frequencies from 50MHz to 3GHz and has some wizardry inside to help reduce false alarms.
Product Page $24.99.
I bet James Bond has one of these.