Source here. (click on image to enlarge) This chart represents the 12-year period starting December 1, 1998 and ending November 30, 2010. The most recent 12-month period ending November 2010 was the 3rd coldest November-ending period since 1999. At some point warming will resume, but the current decade-long plus global cooling trend continues. None of the IPCC climate models, nor "consensus" experts, predicted this level and extent of cooling for the continental U.S. This trend has persisted since the super 1997-98 El NiƱo event.
With the continental U.S. having the most extensive thermometer network in the world, this suggests that possibly other areas of the world would be reporting a cooling trend if they also had the extent and quality of actual temperature measuring coverage that exists in the U.S.
The AGW hypothesis calls for global warming, which is obviously not happening in the U.S. - the case for AGW is significantly weakened by this type of empirical evidence. As a reminder, the climate models predicted "global" warming, not partial-global warming, as seems to be the present situation.
Each red line (link) on graph represents a 12-month period ending in November of related year - continental U.S. temperatures only.
Note: A temperature trend, as shown in the above chart, is not a prediction.
Additional current temp charts here. Historical temp charts here.