While I haven't been reading any primary sources about the nascent rebellion amongst Mousavi supporters in Iran, Andrew Sullivan, Justin Gardner at Donklephant and Josh Marshall/TPM have been doing an admirable job following the tweets and reports coming out of Tehran and elsewhere in Iran.
Based upon all that information, it seems something is brewing Iran. Frustration over Ahmadinejad's isolating tendencies and crippling economic policies have boiled over following the purported outcome of the election - the Iranian authorities first having told Mousavi that he was victorious then only to announce that Ahmadinejad had trounced all takers, winning over 63% of votes cast.
People in and from Iran have been twittering allegations of fraud that appear extraordinarily consistent: ballot boxes stolen and burned, government clampdown on media during the final hours of the election, brute violence, et cetera. Now Mousavi's supporters have taken to the streets and are protesting the election, clashing with police and an internal group called Ansar-e Hezbollah. It appears, based on Sullivan's posting of tweets, that Ansar-e Hezbollah has been targeting college and university students and brutally attacking them.
Could you imagine that in the United States?
Here's a link to English-language twitter feeds that Sullivan compiled: Following the Revolution in Iran.