Iran
Follow ongoing events in Iran's election dispute/demonstration/crackdown via twitter aggregation, links, etc.
FiveThirtyEight.com is covering the statistics of it all in and amongst their other stuff. (Executive summary: Some of the allegations floating around online don't hold much water; others do raise points which seem quite valid; and regardless, if the election was rigged competently, avoiding high-level statistics detection wouldn't be too difficult, so odds are good that statistical analysis won't come up with any sort of smoking gun.)
(A few other articles.)
ETA: High-level overview of Iran's political structure:
(from here; more-detailed but harder-to-follow info here.)
FiveThirtyEight.com is covering the statistics of it all in and amongst their other stuff. (Executive summary: Some of the allegations floating around online don't hold much water; others do raise points which seem quite valid; and regardless, if the election was rigged competently, avoiding high-level statistics detection wouldn't be too difficult, so odds are good that statistical analysis won't come up with any sort of smoking gun.)
(A few other articles.)
ETA: High-level overview of Iran's political structure:
(from here; more-detailed but harder-to-follow info here.)