The Free Link Popularity Checker enables you to check your domain names for their link popularity in any search engine that you desire, among them Alexa Rank, AllTheWeb, AltaVista, Google, HotBot, Msn, Overture and Yahoo. In addition it also checks the Google PageRank for each domain name. For market research purposes, you can also view the sites that may be referring traffic to you and find out what websites your competitors are linking too.