Steve Fossett, known to many as an incredibly intrepid and fearless explorer, has been missing for a number of weeks now. Amazon's helping in the search for him (and his plane) by offering the services of their Mechanical Turk online utility, but a key part of this system is you - the user. Nothing can replace the subtlety and dynamism of the human brain, and they're encouraging as many volunteers as possible to help join the search.
For more info, and to participate, go to the Amazon Mechanical Turk page for Fossett's search, where there's further instructions and related info on the MTurk project itsself. Amazon themselves describe Mechanical Turk as a system where you, "complete simple tasks that people do better than computers. And, get paid for it. Choose from thousands of tasks, control when you work, and decide how much you earn." The Fossett search is unpaid, but definitely worth it if you have any time to spare. Nothing beats the human brain for this kind of thing, and I wouldn't trust a computer alone with the search, so know you're helping a worthwhile cause!