Programming
DailyJS
Best place to go to keep up with all things JavaScript.
Smashing Magazine
An essential source of information for all things web - from designers to developers, front-end and back.
mir.aculo.us JavaScript
A blog from Thomas Fuchs, the author of Zepto.js and script.aculo.us.
Christian Heilmann
A very interesting blog from the "Principal Developer Evangelist of the Mozilla Developer Network"
Shit for making websites
Eh, shit for making websites.
Badass JavaScript
Updated less frequently now, but full of examples from people that are pushing the boundaries of what JavaScript can do.
QuirksBlog
Up-to-date reports on browser compatibilities and any weird implementations that you might need to keep an eye on.
Phpied
A very nice PHP and JavaScript blog from Stoyan Stefanov, a Facebook engineer.
CSS3 Generator
This is so useful that I would marry it if I could...
Ultimate CSS Gradient Generator
...but I would cheat on the above with this nifty tool in a heartbeat.