I am systems analyst at a defense company on long island. We are a little worred that some of our engineer are setting up wireless LANs in labs. I have been given the task to try and combat this if it is happening and then have the ability to check periodically to see if a LAN has been created. I have read that NetStumbler would be able to look for wireless LANs within our building.

First off does anyone have or know of a tutorial for this process or program.
Also, what wireless network card is recommended to be able to use such a program?