Some good tips and guidelines, but in the world of big business, relatively useless. As a former black hat who specialized in corporate espionage (see my NWW blog--Security Phreak), I can tell you that there is little chance of catching the professionals. If a fortune 500 company wants to sucessfully acquire information from a competitor, they will pay a hefty sum to hire someone who can pull it off. When performing a job, one will often spend weeks gathering intel, planning social engineering strategies, and studying the daily routines of key employees--if the price is right. Then again, I've been out of the game for awhile. I'm just another law abiding citizen.