I'm frequently finding myself managing (and troubleshooting) an increasing number of networks that are (more or less) overrun with scores of 2.4GHz; 802.11; Wireless Access Points; and (for the most part) mobile Wi-Fi devices.
What would make my life easier is if I had a Kismet/Airodump style device and/or application that could help me to quickly discover which local Wi-Fi devices are within range (pretty standard so far, but here comes the challenge) and pinpoint (or approximate) the locations of arbitrary mobile network hosts in 3D-Space, by tracing the signals (that correspond to the unique MACs/BSSIDs) back to their individual Wireless Network Interface Cards.
In laymen's terms:
A system for detecting the presence, direction, and distance of local Wi-Fi Devices.
Just like a RADAR, or a metal detector, or a geiger counter.. you get the idea..