We have evidence of one plot against the U.S. from Jihadists in Iraq. Peter Bergen (TNR firewall) argues that the situation is worse than many believe:
Several studies have shown that the suicide attackers in Iraq are largely foreigners, while only a small proportion are Iraqi. In June 2005, the site Institute of Washington found, by tracking both jihadist websites and news reports, that, of the 199 Sunni extremists who had died in Iraq either in suicide attacks or in action against coalition or Iraqi forces, 104 were from Saudi Arabia and only 17 were from Iraq. And the University of Missouri’s Mohammed Hafez, in a study of the 101 known suicide bombers in Iraq from March 2003 to February 2006, found that, while 44 were Saudi (and eight were from Italy!), only seven were from Iraq. Most of these foreign suicide attackers are affiliated with Al Qaeda in Iraq, which the DIA judges to be "the largest and most active of the Iraq-based terrorist groups." Meanwhile, a classified U.S. Marine assessment of the situation in Anbar province–obtained by The Washington Post in November 2006–states that Al Qaeda surpasses all other groups "in its ability to control the day-to-day life of the average Sunni" and is an "integral part of the social fabric of western Iraq." No wonder the organization felt emboldened to recently declare an Islamist emirate in Anbar province.
Hey, we sent, er, 4,000 more troops there. Stuff happens.
The Dish 