Juan Cole notices something significant:

Another remarkable dimension of Sunday's events was the sheer number of cities where significant rallies and clashes occurred. Some of those allegedly killed are said to have fallen in Tabriz, a northwestern metropolis near Turkey. Even conservative cities such as Isfahan and Mashhad joined in. Shiraz, Ardabil, the list goes on. The attempt of some analysts to paint the disturbances as a shi-shi North Tehran thing has clearly foundered.

The most ominous sign of all for the regime is the reports of security men refusing orders to fire into the crowd.