1. Signal to Noise - Great blog - highly recommended By 37Signals, about design, business, experience, simplicity, the web, culture, and more. From the company that brought us RubyonRails.
2. Smashing Magazine - About the latest trends and techniques in web-development - clearly, precisely and regularly. Tons of great examples of excellent designs in action.
3. UIE Brain Sparks - By Jared Spool and the rest of the User Interface Engineering staff. "our repository for everything cool and interesting that is happening in the world of designing usable web sites and systems." If you are involved in graphic design and not reading this, start now.
4. Randa Clay Design -

More worthwhile site from the Curious Cat Web Directory: graphics - web site devopement - making money online