I guess that contests are very effective and original way of website promoting. If you know any interesting contests, please post their rules and details in this thread. And let me be the first to post: One SEO blogger organized the next contest: he offered the participants to create special pages at their websites, which was devoted to his blog. He gave them a month of time and promised 1000$ to that participant, whose page would be on the first position of Google SERP by the query, which consisted of his blog name. So, now is your turn to post contests)