But if you are a happy compulsive you can now even add descriptions to the front of the book or get the real cover (in the case of the big six publishers) OR increase font size - and do it all in batch conversion, too. ^^

Actually I've been using Calibre the other way round - if an author only sells on Amazon.com I can buy the book, get it send to Kindle for PC, rip the DRM if necessary and convert it to .epub in Calibre, then upload to my Sony.