After yesterday's murderous violence by the regime, there were fears that the Iranian green revolution might have stalled, and that opposition supporters would be afraid to come out on the streets today. This video (via Andrew) appears to show this not to be the case, and gives cause for hope. (More here).
Apparently they're chanting: 'Natarsid! Natarsid! Mah hameh bah ham hastim!' ('Don't be afraid, don't be afraid, we are all together!') and then 'Marg bar Dictator!' ('Death to the dictator!')