Google Reveals Open Web Secrets
Google DocType is divided into five parts. The first four are presented on a wiki (and yes, anyone with a Google ID is allowed - even encouraged - to log in and help out). First, there's a section of HOWTO articles on things like web security, DOM manipulation, determining the version of Flash in a browser, and so on. There is a considerable amount of good content here; enough that you could even build a one-semester course around it already.