Videos from Tyler Dewitt, Mr. Anderson, Crash Course, Prof. Dave, Khan Academy and Organic Chem Tutor!
A simple animation, too.
Section 20.3 in the text.
Here's a nice visual of the dynamics in a galvanic cell. Here's another showing the role of the salt bridge.
Lab Exploration Guide and Table (guide and table keys)
Concept Builder: Galvanic Cells