Kindle reads only Mobi format so far, Richard. But you can convert ebooks to that format, if they don't carry DRM-padlocks, using the excellent and free Calibre Library software (
http://www.calibre-ebook.com). Thousands of us here at MR and more than a million other ebook readers swear by it, whatever device we use. A wonderful piece of kit and developed by an active member here, Kovid Goyal. Good to have your company, Richard, and very best wishes. Neil