Iran's New Law To Silence Bloggers

BBC Reports:

Iranian bloggers have reacted with anger and scorn to a new law requiring them to register their websites and blogsites with the authorities.

Also on December of last year guardian reported that Iran blocked access to top websites:

Iran yesterday shut down access to some of the world's most popular websites. Users were unable to open popular sites including Amazon.com and YouTube following instructions to service providers to filter them.
Similar edicts have been issued against Wikipedia, the internet encyclopaedia, IMDB.com, an online film database, and the New York Times site.

Attempts to open the sites are met with a page reading: "The requested page is forbidden."
The clampdown was ordered by senior judiciary officials in the latest phase of a campaign that has seen high-speed broadband facilities banned in an attempt to impede "corrupting" foreign films and music. It is in line with a campaign by Iran's Islamist president, Mahmoud Ahmadinejad, to purge the country of western cultural influences.