Another interesting issue comes from Google. Everybody knows making "strange" (maybe it's better to say: forged) requests to google search engine, you can obtain lots of hidden informations. But today, to me, is more and more easier.
Try the Super Secret iPhone KEY. It's amazing to see that. No forged requests, No strange sentences presents inside the pages, No strange parameters like "id=-123" or "index=log", Not encoded word.. No more secrets ? At least, ..., some times ago was less easier to find something like that, but what about now ? Again, I'm envious, Google search algorithms are the best.