This short clip of a khutba by Hazim al-'Araji, a prominent figure in the Sadrist movement and the Mehdi Army, calling for the Shia to kill and torture Sunnis, especially the 'Wahabbis' and 'Baathis', is circulating widely via SMS, email, and forums. The Araji clip as produced by Ansar al-Sunnah was only a few minutes long, and bracketed his speech with clips of heroic 'mujahedin' executing blindfolded Shia in revenge for Saddam's execution. Lovely.
While it's hard to know for sure, these short video clips seems to be having a pretty big impact on inflaming sectarian attitudes around the region - and to be having increasingly greater impact than long speeches or videos by al-Qaeda's leaders. A friend of mine told me that when he was recently in Saudi Arabia, everyone he met had seen and been engraged by another video clip featuring a shaykh's opinion on the relative merits of the Shia and Sunni. I had a similar experience in Egypt with the police abuse video, which everyone seemed to have seen and many were eager to share. This particular media form seems particularly well-suited to getting people worked up - easy to circulate because they are small files and requiring very little by way of attention span.