Reading Usable Help
@UsableHelp on Twitter
Gordon R. Meyer
20 Things about onscreen documentation
Google's 20 Things I Learned About Browsers and the Web is a fascinating onscreen book. It quite literally mimics the form and feel of a book, and it does it solely by using modern web authoring techniques instead of specialized plug-ins. For that reason alone, it should be required viewing for any tech writer.
It's also notable for its charming illustrations, it's head-on attempt to document abstract technical concepts for end-users, and it's surprising feature that allows you to leave the site and then return to resume reading where you left off.
As for the content, while it is well-written and challenging, I personally found it to be too long and probably of little interest to a typical web user. But as an overall effort, it's well worth studying.