TrackStick GPS Data Logger
Found this interesting device in my browsing online today. It is supposed to run on 2 AAA batteries and it tracks where it's been. Then when you connect it to your computer you can retrieve where it's been. Pretty cool device
Think Geek - TrackStick GPS Data Logger
Interesting Spectrum Analyzer for the Wi-Fi spectrum. It is a USB dongle with a CD that is runnable under windows as well as software for running under Linux. The neat thing is it's only $99. It give you an interesting look at the Wi-Fi spectrum.
Think Geek - Wi-Spy
MetaGeek - Wi-Spy