Here’s a clever WordPress site: Take My Tech is giving away used gadgets by selecting a random commenter when the number of comments on a gadget reaches one hundred. The site will pay for shipping (and hopefully make the owner a few bucks) with the revenues from advertisements. It is a bit of a gamble for the owner—craigslist or ebay would be the more obvious choices—but I find it clever all the same.
The lottery process, including checking for duplicate comment emails/IP’s, could be automated with a plugin. I suggested building on top of my own Cap Comments plugin.