Is anybody aware of any reputable 'search engine friendly' affiliate programs ... ie. the links count toward Page Rank and link reputation. We've got a client who desperately needs such a campaign (he's too reliant on search engines given the current power of Google) ... so it might as well accomplish two goals simultaneously.
Well, you might find that a programme using 301 redirects helps. An HTTP_REFERER based programme would be ideal but affiliates might not like the idea of loosing commission on people using REFERER-less browsers.