[donzimmer]

In the US, that would be mypoints.com -- or airlines, hotels, etc. have sites that allow you to earn miles when you shop through them. (American Airlines' is called https://www.aadvantageeshopping.com/ -- a truly horrible URL, but I have gotten many miles posted to my account from that site.) Mypoints gives you lower payouts but you can redeem them for all kinds of gift cards, etc. AA, et.al., give you higher payouts but of course they are in harder-to-redeem airline miles.

As far as I know, though, Amazon doesn't participate in any of these, as they don't like "middlemen" dealing with their affiliate program. Wonder if refer.ly will have similar issues down the road with Amazon.