The latest version of Amazon’s recommendation page is built around tiles of categories, with one or more items composited as the representative image of the category. I find this less-than-useful, because I generally have no interest in the representative items, making me less likely to click and see what the other recommendations are as I skim across the page.
Also, the categories seem to be based on user-supplied tagging, so that things end up in unusual places. For instance:
The 7 “children’s books” were: Zelazny’s Madwand, four of Smith’s Lensman novels, Sabatini’s Captain Blood, and some random guy’s Sherlock Holmes story. So, the representative image is something I don’t need to buy (an $8 ebook of a novel first serialized in 1939), the category name is something I don’t want, and the actual search results are mostly things I already own.
My actual wishlist for the Amazon recommendation system is a “less like this” button, so that the first N pages of results won’t be dominated by things related to a single recent purchase, like a watch, a box of coffee pods, or (ghod forbid) a Destroyer novel (seriously; never buy a book in a lengthy series (150!) without marking it “don’t use for recommendations”).