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University of Bristol: Colloid Chemistry
An excellent site for learning about colloids. Content includes an explanation of what colloids are, types of colloids, how colloids are formed, properties of colloids, the Tyndall Effect, and examples of colloids.
Chem Tutor
Wyzant: Lessons: Chemistry: Other Types of Mixtures
A discussion of the "other" mixtures, colloids and suspensions. A good overview of these types of mixtures. It also provides a table of the properties of colloids.
Other
The Science House: The Cat's Meow Lesson Plan
Experiment provides this activity used to create interest in a common substance: milk. Students are asked to form a hypothesis about the behavior of milk as household detergents act upon it. The most important aspects of this activity...