I was going through some bookmarks that I have just had sitting around for a bit when I came across this. This is the web developers handbook. It is a list of thousands of links categorized into helpful headings.
The list is incredible. It has the simple things like CSS cheat sheets and basic web tools but then it starts to blow you away with lists of daily inspirations for designers, web design daily reading, CSS theory, color tools, SEO tools and so on. It is an exhaustive list covering everything you could possibly run into while developing your current or next project.
I am adding it to my toolbar right now