ACT360 Media
Act Den: The Museum of Modern Technology
Informative, fun, and humorous tutorial that uses cartoon characters to provide an introduction to information technology. The tutorial covers operating systems/desktops, email, the world wide web, and networks.
University of California
Univ. Of Melbourne: Managing Uncertainty in Gis
A unit of the NCGIA core curriculum in GIS (Geographic Information Science), the author gives a full discussion of uncertainty, its sources, how to deal with it, what plans to make. Very thorough.
Khan Academy
Khan Academy: Binary Numbers
An overview of the binary number systems in computer science.