knowledge tree

What got me to this web-page was the knowledge tree but the other pages on the website are just as useful to use and get ideas from. I liked how the knowledge tree showed what i thought was all the sites we go to when we want to learn something new and where which one get the information from the most. It and a good hierarchy in the middle then had the lesser ones smaller. they didn't use a color a scheme and it isn't very visually creative but they do use symbols and icons which help to understand what they are talking about.