either do a search on LynnTheDem at DU. She's got all the articles linked up, or go to josh marshall (www.talkingpointsmemo.com). He's got the skinny on that as well, with links.
Note on (b), if your colleaguge thinks reporting in the Washington Times is 'credible,' then good luck convincing him of anything!
For c), actually, US intelligence is still looking at the tape, and no decision on its (1) credibility or (2) threat assessment has been reached.
http://www.csmonitor.com/2004/1029/p06s01-wosc.htmlhttp://www.washingtonpost.com/wp-dyn/articles/A3742-2004Oct27.html"The problem, say ABC News executives, is that they can't determine whether the tape, obtained by a producer, involves a real threat -- or even the identity of the figure on it, a man wearing an ammunition belt and a headdress that obscures his face. The network enlisted the aid of the FBI and CIA but still can't authenticate the 75-minute videotape."