Simple answer: security by obscurity is no security. Passive Wifi scanners will pick up the SSID nontheless. Or maybe I'm wrong here but the ESSID will definitely still be readable. Also: MAC-Filters are equally retarded as a security measure albeit for a different reason.

by John Brunner Read it. It really opens up a new perspective on information and secrecy to most. Also it's classic literature especially for anyone who considers himself a digital native (for lack of a better word). But then again a handicap of most digital natives is the inability to read anything longer than a wikipedia article.

With ebay rep systems might work, but do a quick google on sims mafia you can see how these systems can have a major backlash if they're not thought through.