wikiHow is a collaborative effort to create the world's most helpful how-to guides. Like Wikipedia, wikiHow is a wiki, in that anyone can write or edit a page on the site.
ChemReference is a Periodic Table and Chemistry Reference site. You can find elements (search by symbol and name), look up their properties, get orbital filling and visual look of an element (electron shell), etc.
LearnThat.com Offers free web based training to users of all levels, ranging from computer and business courses to just plain fun topics.
Tubetorial.com Provides step-by-step video tutorials on tech and multi-media topics in a quick and easy serial format.
Tutorialized.com One of the top tutorial sites on the Web with over 8,000 tutorials in more than 40 categories.