Saw a link to Blufr on Widgetbox. I’m thinking about putting it in the sidebar of this blog, but it’s probably too crowded over there already. In the interim, here’s a sample:
It is easy to use – you are presented with a true or false question. Select the answer you believe is correct and the link opens up to tell you if you were right. It is easy to just keep clicking, though. You’ve been warned.