Texas A&M University
Wtamu Virtual Math Lab: College Algebra: The Fundamental Counting Principle
Contains a tutorial on the fundamental counting principle that includes many examples and sample problems.
Math Planet
Math Planet: Algebra 2: Counting Principle
Video lesson helps to explain the counting principle. [0:42]
Cool Math
Coolmath: Fast Counting (The Counting Principle)
A tutorial on combinatorics methods of fast counting.
Richland Community College
Richland Community College: Math 116 Lecture Notes
This site from the Richland Community College provides the detailed lecture notes to a college algebra course, complete with equations and definitions. Content ranges from "functions and their graphs" to "conics and parametric equations."