I read a very interesting article on Dave Taylor’s Blog today.
It’s about the hijacking of affiliate links and has a lot of useful information and links.
This is done by scumware programs that install themselves on the computers of surfers or that are inadvertently downloaded by people downloading free smilies, screensavers, games and the like.
When the surfer goes to your site and clicks on something, the linking code is rewritten and someone else gets the sale.
Dave’s blog has some solutions to the problem, cloaking scripts and redirects for your links.
Definitely worth reading!