We just want to say thank you to Ozh, Justin Tadlock and Brad Williams, that they mentioned our website in their new book Professional WordPress Plugin Development. We are just one of a few recommendations in this book and we really appreciate that. We didn't read the book yet, but we are pretty sure that the content is excellent and has some really neat tips to write your own Plugins. You can check it out here.
FYI we don't use an affiliate link, so we are not biased. It's just a way to say thank you!