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.
.net is the world’s best-selling magazine for web designers and developers, featuring tutorials from leading agencies, interviews with the web’s biggest names, and agenda-setting features on the hottest issues affecting the internet today.
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.
Tutorialized.com One of the top tutorial sites on the Web with over 8,000 tutorials in more than 40 categories.
TutorGig.com Provides links to tutorials covering over 3,500 topics. If you can't find the tutorial you need here, it probably doesn't exist. The site also has encyclopedia, courses and forums sections.
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.
FindTutorials The ultimate tutorials site with hundreds of free online tutorials on every subject from using word processors through to advanced techniques in web development/database design and network routing. Set some time aside for this site.