A dazzling constellation of book covers
Based on the "Customers Who Bought This Item Also Bought..." links, Andrei Kashcha has used Amazon data to create a dazzling constellation of book covers which link to related titles. The search defaults to books, but the dropdown menu will let you search for CDs, jewelry, musical instruments, etc, etc. Rolling your mousewheel lets you zoom in or out on the constellation of recommendations. Click once on a cover to find out more about the book, or double click to redo the search using your new choice.
Just type in a book title to see how it works!