a science game: "a virtual Darwinian aquarium .. you initiate a primordial soup, and .. check up on what Virtual Mother Nature is up to - about every 15 min. (or every few days)"
basic concepts broken down into useful small steps, with many visual examples to guide process. Web 2.0 in that it provides for interaction and author's introduction to sections.
personal productivity, life hacks, and simple ways to make your life a little better; check out "classics"; good for grad students who need to organize gettting through and out earning a real living
a visual map, with links, of how to use metasites for knowledge acquisition, research, and reading online; author has other such maps on his site; useful for students as mode of presenting info and for info itself.