Here’s a neat little time killer. JudgeBy.com displays cover images from Amazon and you have to guess what their 5-star rating is. I played for 20 covers and never got one right. I think it’d be more fun to play with just fiction covers or some sub-set, because once you get to a cover like

You really just can’t tell if all of the home schooling folks’ reviews were good or bad about this book. In reality, there isn’t much of a relation between “best-seller” and “good cover design”. You just have to look at the Best Sellers Lists in all the papers to see that, which is a shame. But this is a fun little time water built on the Amazon API though. Can you pick a best-seller simply by looking at the cover?