We have an active in-house affiliate program which has a create-a-link function where affiliate, as in most affiliate programs, can build links back to our content to produce sales. The problem that I am seeing is that some of the affiliate URL versions are being indexed in Google rather than the original page. For instance.. http://www.ourdomain.com/page_start.aspx?affnum=F025212&Start_Page=RaceCar&referrer=createlink is outranking... http://www.ourdomain.com/racecar This presents 2 issues for us. First, this presents duplicate content issues obviously. Second, we pay our affiliates a portion of the sales so, in order to maximize profitability, we'd like the indexed pages to be the original version. What's the best way to handle this? I want to make sure that affiliates continue to get credit for links from their sites but search engine links should go to the original versions.