43Things - Discover what’s important, make it happen, share your progress. Find your 43 things. Have a look at my list (currently 11 things)
Quirksmode - contains more than 150 pages with CSS and JavaScript tips and tricks, and is one of the best sources on the WWW for studying and defeating browser incompatibilities.
Dynamic HTML and XML: The XMLHttpRequest Object - tutorial from Apple on how to use the W3C implementation of XMLHTTPRequest object.
How to be a Programmer: A Short, Comprehensive, and Personal Summary
BugMeNot - bypass Compulsory Web Registration (i.e. NYTimes).
SQL Injection Attacks by Example
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Working on a longer post about web-applications.