The UN estimates that over 34,000 civilians were killed in 2006, according to this press release. Of these, over 6000 were killed between November and December of 2006.
The full UN report on human rights for November and December of 2006, can be viewed online. ReliefWeb, a Internet hub for time-critical humanitarian information on Complex Emergencies and Natural Disasters, which is operated by the United Nations Office for the Coordination of Humanitarian Affairs, also has a number of additional reports on Iraq.
For additional information on Iraq, check out the library's country guide.