I'd agree that the WMD seems to have simmered down considerably, and I doubt anything else is going to come out of it, unless it HELPS Bush in some way.
The issue of whether there was WMDs will be brought back up again for a short time during the next state of the union, when the media starts talking about the africa/uranium comment of last year's SOU, which will prompt discussion on WMDs, etc, and it'll go away again with the NH primary. Of course, the Democratic nominee will bring it up during the general election, but I don't think it'll have that much impact, unfortunatley.
Speaking of the SOU, I heard that Wes Clark will hold a town hall broadcast of the SOU speech. I don't know if he'll be giving a play-by-play or wait until the speech is over and then talk. It should be an interesting exercise.