Are you an active Kindle reader who takes notes and highlights passages for later reference? Then you might want to pair Evernote with your Kindle to have all those book quotes and information in one place.
Productivity blogger Jonathan Milligan offers this simple solution to turn your Kindle notes and highlights into (searchable) notes in Evernote. All you have to do is head to your Kindle account on Amazon, select one of your books, and go to the notes and highlights page. Then, use the Evernote web clipper to save the entire page. (You could do this with other clipping tools too, such as OneNote.)
This is best for books you're done reading, naturally, unless you want to clip again after you add more notes and highlights.
Milligan also has a guide to sending your dead tree books' highlights and notes to Evernote, which requires taking photos of your notebook or highlighted parts of the book.
A Simple Guide to Indexing the Kindle Books You Read for Evernote [Jonathan Milligan]