If you want to contact me for questions, errors on this site, additions etc., the best way is through the Arduino forum. My user name there is JanD, just send me a Personal Message if you want something.
If you don't want to register to the Arduino forum to contact me, contact me by mail!: jan[at]dalheimer[dot]de
(if you can't figure out what to change in the email address, you shouldn't contact my by email)