I prefer to create my own services, which are useful for the people. Here is the example. www.leak.info / Internet marketing research I calculate the citation ranks for the best Web pages, find the incoming links for the domain names, explore the expired domain names, and publish the results. The ciation ranks are calculated according to the definition of the Google PageRank, as the probabilily, that the person, which randomly clicks through the links, will arrive at the particular page. My services are free of charge.