Google has launched a new feature in its search results, which displays results that are deemed "similar" to the query. If you search for eBay, for example, you may get results for Craigslist, uBid, Buy.com, and ebayanuncios.es. Basically, if someone searches for a brand, there is a good chance Google will inject links to the competition on that results page by default (though at the bottom). It's actually not a new feature entirely.