While Iraq has been cooling down, Afghanistan has been heating up:

The conflict there has usually been divided between summers and winters, with summers seeing most of the combat. The above chart shows the divide pretty clearly, and it also shows that coalition fatalities in-country are increasing in both seasons.

The worst month for coalition forces in Afghanistan was July 2009, when 77 fatalities occurred. That month still does not rival the worst months of Iraq (141 in November 2004 and 131 in May 2007), but each summer and each winter has seen a higher number of fatalities, and January 2010 is, only 12 days into the new year, already the second-worst January of the war.

(source for fatalities)