I'm seeing the bulk of the pages returning links to my sites coming from pages like: http://www.yoursearch.co.uk/uk.php?ass=1177&qry=Billetterie+Sortie http://www.yoursearch.co.uk/uk.php?ass=1177&qry=Inspector+Gadget These pages are obviously not indexed by google, but show up in Yahoo's results. I find it hard to believe that these links, which are not linked from anywhere, have any effect on the SERPs, but please correct me if Im wrong, and please explain how they can possibly help.
PR0 site, full of affiliate links.. can't see that possibly helping in the serps. Is one of the sights on the co-op network?
If they aren't indexed by Google, then they are basically "free" because the weight of the user is based on what Google knows about.