If you plug your Kindle into your computer it will go into USB mode. From there you can view the files on your Kindle from the Mac’s Finder. Navigate to /Documents/My Clippings.txt and guess what? It’s a text file with all your highlights.
Fabulous. Just tried it on my Kindle 3 and they’re all there.
Previously, I was copying the books and the .mbp files to the Kindle Mac App documents folder, but irritaitingly the desktop app doesn’t allow you to copy passages either.
There was a hacky workaround using the search functionality, but this is so much better if you’re as prolific a highlighter as I am.
Thanks to Shawn Blanc for helping to preserve my sanity.