From the US Central Command website:
International Contributions to the War on Terror
The United States began building the coalition on September 12, 2001, and there are currently 70 nations supporting the global war on terrorism. To date, 21 nations have deployed more than 16,000 troops to the U.S. Central Commandâ€™s region of responsibility. This coalition of the willing is working hard every day to defeat terrorism, wherever it may exist.
In Afghanistan alone, our coalition partners are contributing nearly 8,000 troops to Operation Enduring Freedom and to the International Security Assistance Force in Kabul â€“ making up over half of the 15,000 non-Afghan forces in Afghanistan. The war against terrorism is a broad-based effort that will take time. Every nation has different circumstances and will participate in different ways. This mission and future missions will require a series of coalitions ready to take on the challenges and assume the risks associated with such an operation.
Coalition forces have made important contributions in the war against terrorism across the spectrum of operations. Particular contributions include, but are not limited to, providing vital intelligence, personnel, equipment and assets for use on the ground, air and sea. Coalition members also have provided liaison teams, participated in planning, provided bases and granted over-flight permissions â€“ as well as sizable contributions of humanitarian assistance.
The CENTCOM site has lots of great information on how the US military and our allies are prosecuting the global struggle against extremism. You may also want to check out the news release Task Force Baghdad Updates Reconstruction Process and the ongoing feature “What Extremists are Saying”.