They've found one shell, two if you count the mustard gas find last week. So let's not get carried away. It will take more than this to give general credence to the WMD issue. We're not going to try to justify this war only on the basis of discovering these two shells.
It's significant not only that the shells were found, but that they were in the hands of pro Sadaam insurgents who were able to access them somehow. Apparently, the shells don't look all that different from conventyional shells, so whether the insurgents knew wjhat they had or not, they came from some Iraqi storage that included WMDs.
How many shells "justify the war"?