SelectThing
Screenshots
I'm a big fan of cataloging books I want to read on LibraryThing and often run across mentions of interesting books while browing the web. But it always distracted me to copy the book's name, open a new tab, pull up LT, go to the add page, paste in the text, hit search... So, like a good geek, I wrote a Firefox extension to simplify it.
When you see an author or title you're interested in, select it and right-click (control-click for Mac users). Then select "Search on LibraryThing":
After you click, you get a new tab in the background and can continue your browsing uninterrupted:
Over on the LibraryThing tab, the Add Books page has searched on your selected text, and you can use the website normally:
Keen, huh? Head to the install page to get it for yourself.