AmazType is Amazing
Found a great link (of course!) while catching-up on Seth Godin's blog. AmazType will create an interactive graphic of any word you type in their search-box, comprised entirely of book covers pertaining to the subject!
The graphic is completely interactive, and you can click each book cover for title, author, pricing, and average review rating -- you can then click again to purchase the book, or zoom-out to see the entire graphic and choose again.