Great idea, particularly since many of us order a variety of items from Amazon. But what about some of the more common equipment and film sources: Freestyle, B&H, etc? I usually try to click through the partner links (particularly for Freestyle), under the assumption that doing so let's them know that apug subscribers support their business.
I have been offered affiliate programs by several photo retailers such as Adorama and B&H, but reject them as it is unfair to our many smaller advertisers that sell photo products. I believe some shops like Freestyle track clicks from APUG to ensure advertising with us is worthwhile, but there is no official affiliate program. It can't hurt to mention to the advertisers that you found them via APUG. I went with the Amazon program because they offer a lot of products that would not conflict with our current advertisers. I suppose I'll try it for a month and see what happens, if it brings in like $3 a month then I'll remove it.