We just added the ability to edit the “Find At…” links that appear in the left-hand column on book pages, under the cover image. The link options include bookstores, book-finding services, publishers, swap sites, and hundreds of library catalogs from around the world. All together there are almost 500 options for ISBN-based services to choose from, and if we missed any, you can add them–the page for selecting links is itself editable.
If you don’t bother editing your links, the default set is selected based on your language–people viewing the site in French should see AbeBooks.fr and Amazon.fr, rather than their .com cousins.
Please let us know if you have suggestions for default links for the non-English sites, or other ways we can improve the links and this page. Given the staggering volume of contributions from LibraryThing members, this has the potential to become a very rich repository of online book services.
The current contents were derived from Wikipedia’s Book sources page. Both it and LibraryThing’s version are covered by the GNU Free Documentation License, so contributions will benefit the widest possible audience.
Update: We’ve opened a group, Book links questions and help, for people who want to make updates. We’ll add a helpers log soon.