I just posted a new Klinefelter book on my website. No, its not mine, unfortunately, that one is still in the works. If you go to http://klinefeltersyndrome.org you'll find a link to it right from the first page.  I've known the author for about 10 years, and he's done a nice job with the book. By the way, its a PDF file, so its easy to download and read.

Stefan Schwarz