University of California
Uc Davis: The Chain Rule
Nice comprehensive site on the chain rule the site explains the notation that goes along with the common notation of the chain rule through examples.
Math Medics
S.o.s. Math: The Chain Rule
Finding derivatives by using the chain rule is explained through examples in this tutorial.
Interactive Mathematics
Interactive Mathematics: Powers of a Function
The Chain Rule is presented with a detailed example. It is followed by a demonstration of how the Chain Rule is applied to power functions.
Other
Karl's Calculus Tutor: The Chain Rule
This site provides a detailed overview of the chain rule. Content includes several examples, applications, and exercises.