PBS
The Dating Game: Radiocarbon Dating
Part of PBS-NOVA Online. An excellent explanation of how radiocarbon dating is done and why it works. Great material for earth science, history or biology classes.
CK-12 Foundation
Ck 12: Earth Science: Radiometric Dating
[Free Registration/Login may be required to access all resource tools.] How scientists can use radioactive decay to find the age of certain materials.
Other
Carbon 14 Dating
Seven pages all about Carbon 14 Dating. Information on half-life, Carbon 14 used to date specimens and artifacts, limitations, charts and graphs. Michael E. Brown Ph.D. contests that the limitations of Carbon 14 dating support the theory...