I've just heard over on MobileRead that Amazon have updated the Kindle4Mac reading app. I don't have a Mac so I cannot confirm this. Here are some of the improvements in the latest update:
- Use the built-in dictionary to seamlessly look up the definitions of English words without interrupting your reading.
- Real page numbers for thousands of books in the Kindle Store. Now you can easily reference and cite passages, and read alongside others in a book club or class.
- If several other readers have highlighted a particular passage, then that passage will be highlighted in your book.
- Choose whether you'd like to browse your library in a tile view or in a list view.
You can download the app from Amazon or from the Mac App Store.