I recently added 3 new flyers to the wall, these are sites I visit on a regular basis -
Smashing Magazine is the ultimate web designers resource, whenever I need inspiration or ideas on how to do something this site has become my first port of call.
CSS Remix is one of the best CSS showcases out there, constantly updated and the featured sites are always of a very high standard.
Boagworld is full of articles offering advice on managing and building websites, it also has an associated podcast which I recommend listening to.
Please share your favourite web design and resource sites with me.