[jerf]

There are a ton of these. Here is one of several times HN has talked about them: http://news.ycombinator.com/item?id=700143

Actually, "site:news.ycombinator.com swoopo" goes on for a while on Google, and that's just one such site...

Edit: Ah, and from http://news.ycombinator.com/item?id=978097 we get http://www.pennyauctiontraffic.com/ . Yow.