Here is a resource for facilitating dialogue that may be helpful in a congregational setting: U.S. Policy Toward Iraq: What Should We Do? by the Study Circles Resource Center.
Worship resources.
The Evangelical Lutheran Church links to worship resources from several Protestant denominations. A brief essay from the Episcopal Church on prayers of lament will undoubtedly prove useful. The United Church of Christ has developed a resource called “Patriotism, Nationalism, and the Christian Life.” The UCC also offers a liturgy for peace in a time of war (pdf).