First is the "revolting index" by Alen Mattich at the Wall Street journal. You can see it here at his blog.
Note that Azerbaijan, according to these tools, is ripe for an Arab Spring-style revolution. (It's ranked the third-most likely country to revolt in Freeland's index!)
The Economist Intelligence Unit brings us a quantitative tool for predicting revolts in the Middle East only. Fun to look at, and you can change the weights of the factors by clicking on the "interactive shoe-thrower's index."