Why isn't this front page news?

I hadn't heard about this at all until my friend Mary said something about it -- the use of white phosphorus in Iraq as a chemical weapon BY THE U.S. For some reason this story isn't getting traction in the "mainstream media" but I figure it can only be a matter of time (like the torture issue). There's a concise explanation of its use and the attendant issues at dailykos: http://www.dailykos.com/storyonly/2005/11/21/173814/60