University of Michigan
University of Michigan: The Big Bang It Sure Was Big!
A detailed examination of "what is known about the Big Bang itself, the age of the universe, and the synthesis of the first atoms."
Other
The Expanding Balloon Experiment
Great science experiment to help aide in the understanding of the Big Bang Theory. Students are able to complete this experiment with little materials and individually.
PBS
Nova: History of the Universe
This interactive timeline provides information on the big bang as well as other major events of universe evolution. It also provides predictions about the universe's future.
Other
Montana State Univ.: Expanding Universe (Lesson Plan)
This site has a lesson plan in which students gather evidence supporting the Big Bang Theory using a balloon model of the expanding universe.