Did this work for you on the latest versions ? I tried a couple of these programs - but none worked. There was a voodoo trick which involved running the kindle on windows (which I do not have) and snarfing the book from within memory while it is decrypted... It reportedly worked, but I could not check because I do not have Windows.

For myself I found an approach which I might finish sometime: Kindle on wine, a small X application that takes a screenshot of the Kindle window, OCRs it via tesseract, and then sends the emulated "right" keypress. The OCR quality was pretty good, of course I'd lose the formatting, but then no need to worry about Next DRM Format.

Just to clarify: all of the above is for purely being able to search/copy, etc. from the contents. I love the auto-sync capabilities to a point that when I see a pdf of some book that interests me, I go and try to buy a kindle version. But the DRM is the most annoying thing since the nail in the shoe :)