Follow-up - looks like the US may have succeeded in uniting the usually-bitter-rivals, the Shias and the Sunnis, albeit not in the manner that they had maybe hoped.
Muslim Rivals Unite In Baghdad Uprising (l/p: cpunx/cpunx)
"'What Moqtada Sadr did simply woke up the people,' said Sarmad Akram, 36, who owns the small food shop next door. 'Now the people have the guts to resist.'"
Although, judging by comments such as "You have not seen anything yet. ... You will see a new style of resistance in the city. Well-organized. Advanced. They will be surprised. They won't know what to do." is there a possibility that this uprising has been stirred and orchestrated by those who, up til now, have been happy just bombing things?