15 Essential Checks Before Launching Your Website
Good macro list of things to check/do before launching a new website (or major revision).
#reference
Drupal Visual Language Guide
This is a really well-prepared and professional style guide. It’s a great example of covering all of the visual elements of a complete online identity.
Quick Lookup
Nice AJAX-powered tool for quickly looking up PHP, MySQL, JS and CSS functions etc from their respective references.
Things you may not know about jQuery
Things you may not know about jQuery
Awesome list of tips for harnessing some of the hidden power of jQuery.
XUL
XUL reference at the Mozilla developer center. Very handy for developing Firefox extensions.
How to build a Firefox extension
How to build a Firefox extension
List of resources and details on how to get started building simple FF extensions, care of LifeHacker.
LJ Client API
The official documentation for the LiveJournal API.
Font Matrix
Awesome matrix showing which fonts are installed on which OSs, with which software etc etc.
Using Javascript to Fix 12 Common Browser Headaches
Using Javascript to Fix 12 Common Browser Headaches
Really good list of fixes for problems. Lots of jQuery examples (of course).
iPhone Dev Center
Home page for developing for the iPhone. Lots of good resources: movies, documents, sample code, tutorials etc.