According to the Committee to Protect Bloggers, Fariborz Shamshiri, an Iranian atheist blogger, has been receiving death threats. Something tells me that this is far more serious in Iran where one can be imprisoned just for criticizing religious leaders. Can you imagine the courage it would take to write not one but several outspoken atheist blogs in a country like Iran?
You can see some of Shamshiri's work at Rotten Gods.