I use the PHP.net favelet that prompts for a function name and takes you to the PHP.net API page. They save a lot of time and don't clutter your Firefox menu bar.
Prototype.js Cheat Sheet PDF
Downloading this PDF is a must for Prototype framework programmers.
Reverse IP Domain Check
Who else is hosted on your shared server? Go here, enter your domain, and find out!
CSS Tricks shows you how to make your images resize with the text...and still look good.
Google Leads, ICANN Follows: Domain Tasters Can Now Eat Dirt
ICANN, who should have taken the first step against domain tasting, has decided to keep the ICANN fee for all domains so to try to prevent tasting.
One of my favorite social APIs was the Open Graph API adopted by Facebook. Adding just a few META tags to each page allowed links to my article to be styled and presented the way I wanted them to, giving me a bit of control...
The MooTools Accordion plugin seems to be the plugin that people seem to have the most problems with. It's an awesome plugin, so I can see why so many people want to use it, but I think that may be part of the problem.