Research Methods Lab - "In the Lab you will learn about the five different Research methods, practice what you have learned, and then take a post-test to confirm your knowledge" - requires free Shockwave plug-in which can be downloaded at the site.
Critical thinking psychology exercises - excellent set of activities on inference vs. observation, operational definitions, correlations, jumping to conclusions, faulty thinking and thinking creatively.
Correlations – Identify the type of correlation in several examples – developed by Traci Craig.