I know this is kind of an old topic to post on but there are some updates on this

I'd like to see a democratic vote of the people of Iran whether they'd like to have their e-mail blocked over this.
A Halal-internet would never work. It would have to be cut off from the rest of the internet. How can IT-companies work from Iran, and besides, there's far too much traffic to police everything, and there would be far too many users to punish.
Slowing down SSL ? I mean, come on, all serious businesses, esp. so in the financial sector uses crypto to secure communication to their sites. If there was a rule that only in-country sites would be allowed to use SSL-certificates, this would effectively put all of Iran behind the rest of the world in regards to using international services on the Internet.
The Internet has come to stay, and there's nothing the Iranian government can do about it. The sooner they realize this, the better.
The Internet is the best thing that ever happened for freedom, communication, democracy and activism.
The thing about internet is iran is that till now it's internet being blacklisted and what the government has in mind (and hopefully fails) is to have a whitelisted internet for the users as there would be intranet sites and some others allowed.
main point is that even if the whole internet is down, there would be no non-functionality or any errors in governmental work as they don't use it as much as the normal people do.
Like the google codes and sourceforge blocking Iran, I don't think there would be any mollas or any one that has problem with USA using these services, only technicals and normal people doing normal jobs installing things on linux would have problems with files hosted on these servers.
I used bitcoin a while ago in Iran and the main problem was downloading the block chain. I'm thinking of hosting a compressed sign version of the block chain and update it once in a while to solve this issue. I've done this for litecoin as a beta project cause the size is smaller than bitcoin block chain. but the compression could really do the job, the size went from 1.1 GB to 300 MB.