View a book from Amazon on Oyster
(note: this was not created by the Oyster team, and thus is not an official Oyster Chrome Extension)
This tells you whether or not the current book you're looking at on Amazon is available on Oyster. If so, it'll show the Oyster logo in the omnibox and clicking it will take you to the book page on Oyster. Woohoo – high fives.