At the risk of being boring, another node related link. A collection of articles written about node (mainly as tutorials) by the node community.
A site I came across some time ago, Try Ruby gives you an interactive (AJAX) ruby shell, with a simple tutorial to follow. In my opinion an awesome way to get started with a new language, I find learning is much easier by trying things out.
If you like this then you may also be interested in Try MongoDB (a similar MongoDB tutorial) and also codepad (a pastebin that allows you to execute certain programming languages and view the result).
Not that interesting, but an awesome site for finding fonts. Currently has over 10,000 free fonts, including the one used for the slogan on this site!