What a great idea? Whenever I recommend books on my blog I usually link to Amazon as it is convenient source of book info and I can make a few pennies if people purchase through those links. That said, I also usually include a reminder that those same books might be available at your local library and highly encourage people to take a look there.
This extension for Chrome integrates that idea right into Amazon book pages. Once you select your local library or libraries, you see an up-to-date count of how many paper and ebooks are available at your library for a given book title. It will even link you directly to the book detail page at the library, ready for you to place a hold and, in my case, have it delivered right to my local library branch. Cool! — Douglas