Beagle - 7:16 pm on Aug 5, 2005 (gmt 0)
I tried Amazon products (instead of books) and utterly bombed. That page is still much more popular than any of my book pages (about 10X the daily traffic), but I have never made a sale.
I've tried some seasonal things -- jewelry and gourmet food leading up to Valentine's day, Amazon's top gift lists before Christmas -- but have never had anyone click on a non-niche-related ad. Funny thing is, people will often add non-niche items to their shopping cart after following a link, but it takes something niche-related to get them to Amazon in the first place. [Edited to add: And, as mentioned earlier, I don't think I've ever sold anything through a general Amazon banner or search ad.]