Check backlinks for any website. This link popularity checker tool allows you to check for the number of backlinks you have on six major search engines and databases and also the number of pages you have indexed on the Google, Yahoo and MSN for any website you enter. You can check for the Google Page Rank, Alexa ranking, the number of backlinks in Google, Yahoo, Alta Vista, Ask, and All The Web. You can also view results for the number of pages indexed in Google and Yahoo search engines. You can also use it to spy on your competition without them knowing. All these will help in monitoring your SEO efforts and also spy on your competition.