CSS-Tricks for css tricks! Smashing Magazine for Design in General. Abduzeedo for Photoshop-Illustrator tutorials. Codrops for cool jquery ideas. http://www.awwwards.com/ to get ideas and be inspired. Stack Overflow for technical questions. and so many more that I can't name them all. I also just discovered this site for HTML5 resources: http://html5bookmarks.com/