You can read it here.
From a cursory look at the resolution you cite, it looks like the globalists have copied the Democrat trick of labeling House/Senate resolution with warm and fuzzy names, but when you get down to the details...
Anyway, Rep. Ron Paul attempted to add a "declaration of war" amendment in the House International Relations Committee. His amendment failed by a vote of 45-0.
Thus proving my point that there never was the constitutionally required legislative declaration of war on Iraq.
A resolution did pass, satisfying your lesser constitutional requirement.
To prove that the constitutional requirement for a congressional declaration of war is more than a figment of the imagination of an overzealous right winger, I have included the following quotes. (Remember, in order to dismiss the relevence of my quotes you will have to resort to the logic used by anti-2nd amendment liberal/communists.)
"The President is to be commander-in-chief of the army and navy of the United States. In this respect his authority would be nominally the same with that of the king of Great Britain, but in substance much inferior to it. It would amount to nothing more than the sumpreme command and direction of the military and naval forces, as first general and admiral...while that of the British king extends to the declaring of war and to the raising and regulation of fleets and armies - all which, by the Constitution under consideration, would appertain to the legislature."
-Alexander Hamilton
The Federalist Papers, No. 69
"The constitution supposes, that the History of all goverments demostrates, that the Executive is the branch of power most interested in war, and most prone to it. It has, accordingly, with studied care, vested the question of war in the legislature."
-James Madison
Letter to Thomas Jefferson
April 2, 17987
"Kings had always been involving and impoverishing thier people in wars, preetending getnerally, if not always, that the good of the people was the object. This, our [1787] convention [which drafted the Constitution] understood to be the most oppressive of all Kingly oppressions; and they resolved to so frame the Constitution that no one man should hold the power of bringing this oppression upon us."
-Abraham Lincoln
Letter to William Herndon
February 15, 1848