Google I/O: Google Doctype
The goal of Doctype is to be the #1 hit for any search term about the open web.
The "open web" is the DOM, HTML, and CSS - "just about anything that you can do on Firefox on 64bit Linux" (ie, no Flash and Silverlight) (and not XUL either).
In scope are those "open web" topics, as well as security and accessibility concerns that affect the "open web" and the closed web features as one needs to know them when using the "open web" technologies.
For offline use, you can use subversion to check it out from Google Code Project Hosting.
Progress so far (about two weeks) - 75 articles, 2800 pages of reference docmentation (ie, "background-color", "orange"), and 10k test cases.