PBS FRONTLINE has their new special available for viewing online in its entirety:
Veteran FRONTLINE producer Michael Kirk draws on one of the richest archives in broadcast journalism — more than 40 FRONTLINE reports on Iraq and the war on terror. Combined with fresh reporting and new interviews, Bush’s War will be the definitive documentary analysis of one of the most challenging periods in the nation’s history.
“Parts of this history have been told before,” Kirk says. “But no one has laid out the entire narrative to reveal in one epic story the scope and detail of how this war began and how it has been fought, both on the ground and deep inside the government.”
Frontline is pretty much the last bastion of serious news documentaries in America, so it’s probably worth a look.
Blendor 
Amazing for the first couple parts I’ve watched online so far. During the show, links pop up for supplemental information.
There’s a great link that shows a timeline of major political players dating back to the Nixon administration:
http://www.pbs.org/wgbh/pages/frontline/shows/pentagon/paths/
that’s awesome! i saw a few of the links, but i was mostly listening to it at work. missed this one, and it’s great.