Poland, Spain, Hondoras, and the Domican Republic all have announced they're withdrawing one after another.
http://www.ireland.com/newspaper/front/2004/0420/3783682793HM1SCALLY.html
Here's a list of the troop levels as of a month ago.
Country City or Region Personnel
U.K. Basra, Southeast Iraq 11,000
Italy Southeast 2,700
Ukraine South Central 2,000
Spain South Central 1,300
Poland South Central 1,300
Netherlands Southeast 1,100
Australia Southeast 1,000
South Korea Southeast 700
Romania Southeast, South Central 700
Denmark Southeast 496
Bulgaria South Central 470
Thailand South Central 460
Honduras South Central 370
El Salvador South Central 360
Hungary South Central 300
Dominican Republic South Central 300
Nicaragua South Central 230
Singapore Arabian Gulf, Baghdad 192
Mongolia South Central 180
Azerbaijan Mosul, Kirkuk, Karbala 151
Norway Southeast 150
Portugal Southeast 128
Latvia South Central 121
Lithuania Southeast & South Central 105
Slovakia South Central 105
Philippines South Central 96
Czech Republic Southeast 80
Japan Al Samawa 75
Albania Mosul 70
Georgia Southeast 70
New Zealand Southeast 61
Estonia Baghdad 55
Kazakhstan South Central 29
Macedonia Taji 28
Moldova Baghdad 24
http://www.washingtonpost.com/wp-dyn/articles/A61544-2004Mar15.html