This is the most detailed information I've seen on the new crackdown in Iran on bloggers. From Diaries of a Steppenwolf.

Apparently the fall of the dictator has had a big impact on Iranian Islamic regime. Those who are in control who possess non-elected power have already felt something.
Recently, a lot of web sites have been banned by a direct instruction from Iranian ministry of telecom. This list includes hadisara, home page of satirist Hadi Khorsandi. Also an entertainment web site called roozi.
But most amazing of them all, is nedstat, which is a hit counter I am using.

There's more on his site.