Scott Johnson at Powerline
points to this article
in the NY Sun about a former USAF investigative officer who found four sites in southern Iraq that he believes contain WMD, specifically chemical and/or biological agents. He reported the existence of the sites to the Iraq Survey Group but they never investigated the sites, according to the investigator.
The sites were buried concrete bunkers near Nasiriyah and Umm Qasr, all of which had tunnel entrances which had been flooded via canals specifically created for the purpose.
Go read the whole thing. Curiouser and curiouser ....