Evaluating the web

In searching Penn State's iStudy tutorials I came across one about using the world wide web with this link to Widener University's library - http://www.widener.edu/libraries/wolfgram/evaluate . It has a real nice audio/visual tutorial with examples, including a comparison of two sites about Dr. Martin Luther King - the one discussed in the November book as well as one from The King Center. It also compares sites about smoking and illustrates the differences between them regarding authority, accuracy, currency and objectivity. While it would not be useful for very young children, it could certainly be used to demonstrate with teens.