If you have been following Iran and want to help but dont know how, here:
reunifygally.wordpress.com/2009/06/17/help-iran/ even the simple gesture of wearing green is enough of a message of support for the plight of the people.
I'm doing my part by relaying tweets and keeping those around me informed. I also set up a twitter (which I despised btw, except in situations like this) and changed the location to Tehran to screw with the government looking for twitters from inside Iran. its a small thing but even if i only manage to throw them off the scent for a minute, i still bought that twitterer a minute to get out before they find them.
Its not whether you do alot or a little, simply showing that you support them is enough to help them.
Its the small things that change the world. and its the individuals that do it