Huge number of Iranians came to streets to show to Ahmadinejad that they won't allow him to steal the election. They showed to hard liners that Iranians do not want Ahmadinejad in power. It was the biggest demonstrations since Shah left Iran 30 years ago.
For more pictures please see the link bellow:
http://www.boston.com/bigpicture/2009/06/irans_disputed_election.html