223980 longtail keyword tool

Im looking for someone to create me a php page or whatever format it needs to be in. What the web page must do is find keywords. So there would be search section fopr keywords in the middle like a google page. I want the search to find keywords and cross refrance them with the amount of results on ebay with identical matches. Im looking to get a top quality keyword finder. It doesnt have to be a web based application but i would rather it be. I want people to be able to find good quality keywords that have little use on major search engines. example of a simular page [login to view URL] But i want mine dig down more and find the best results and compre them to unused resluts.