Amazon showing me the related books based on what I browsed or bought.

I no longer need to go on a wild goose chase googling to find similar books. This way I have found some real gems that I might not have had I simply googled for similar books. So, when I do have to google for a book on a new topic that piqued my interest, I know that once I find an Amazon page directly or find a forum post recommending one and then open that page on Amazon, the rest of the search would be a relatively smooth ride.