I put up a new-and-improved test file for Kindle at:
http://freekindlebooks.org/Unicode/unicode.html
which starts by displaying common code pages, and then at the end displays a list of "all" Unicode code points so that you can see if a particular Kindle hardware device actually display that code point or not. Pretty obvious that Kindle still doesn't have code points for Arabic or Hebrew, but does support CJK among many other languages. I would have though that Kindle would at least want to support Hebrew LTR for example.