Eric Redmond, head of the open source movement called ESR has set up a website to help the Iranians.
There are things you can do to help Iranian activists if you are a bit tech savy.
From the website NedaNet.org:
Doing the right thingCore members of NedaNet have already received death threats from persons plausibly believed to be agents of the Iranian regime or allied terrorist organizations such as Hezbollah. We expect more of us to be targets of threats, intimidations, and possibly actual violence before the crisis resolves. Be aware of that risk if you choose to join us.
But today in Iran, thousands of people are putting their lives on the line every day in direct confrontation with the Iranian regime's thugs, facing danger that reduces any risks we run to a triviality. They're not running away. We won't either.
Public contact and operational security
I'm Eric S. Raymond. Some of you will know me from the open-source movement as "ESR". Because of the real threat of terrorist action against us, most of NedaNet is keeping a low profile. I have volunteered to be a visible public contact because (a) I've done this sort of public-face work before, (b) I already got my jihadi death threat from Iran in 2006 before NedaNet, and (c) I'm not easily intimidated.
Think of me as a cut-out. I have very carefully not asked who our contacts in Iran are. I don't even know who most of the rest of the NedaNet people are, and don't intend to try to find out; they're basically just handles on an IRC channel from whom I get URLs and files. And for any agent or proxy of the regime interested in asking me questions face to face, I've got some bullets slathered in pork fat to make you feel extra special welcome.
Due to agitation by blowhards with too much time on their hands, I add the following disclaimer: I do not necessarily speak for the entirety of NedaNet. (Now maybe they'll stop yattering on the channel so we can get more work done.)
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http://nedanet.org/