>reCaptcha offers a WS based implementation -
>cost free, helps digitizing books and kept up to date by google paid devs.
>
>if you can follow an article in german:
>
>
http://www.heise.de/ix/artikel/Turing-fuer-alle-1033340.html>
>under (at the bottom)
>Links zu diesem Artikel
>(links to this article) you can find client side implementations in java,c# and a few other languages
Thanks, this is great.