Wow, here’s a an evolving index of subjects covered in the main Arduino site, the Playground and the Arduino forum – called: “The World-Famous Index of Arduino Knowledge” Link.
From the pages of MAKE:
Arduino fever. The tale of a cute, blue microcontroller that fits nicely in the palm of your hand, and the expanding community of developers who love and support it. MAKE 07- page 52. Subscribers–read this article now in your digital edition or get MAKE 07 @ the Maker store!