Five Factor Personality Test - generates some interesting discussion! Most of my students didn't think it was at all representative of who they are.

I use this when teaching my students about the Stanford prison experiment.

I use this website to get my students interested in what psychologists actually do and what they actually study in today's world; they're often surprised at the variability of studies and fields!

I use this a lot for my own reference. It's a website written by graduate students that provides quick, easy to read articles about various topics. I really like the relevant examples in each of the articles, too.

Really great website to help students understand the difference between correlation and causation!