Well .. it might be "interesting", but it doesn't seem very plausible to me.
Nick Berg was known for agreeing with the war in Iraq, and generally approved of President Bush. I find it really hard to believe Nick would be associated with anyone like Moore.
CyberAnt, that is just not true. There are only two people that I know of who are saying he approved of President Bush and the war. Both have a reason to hide the truth. Meanwhile, his brother and people who knew him in Norman Oklahoma (where he "coincidentally" met the would-be 9/11 terrorist and gave/lent him his email password) indicate otherwise.
Consider: if his father put him in touch with Michael Moore for a job that ended with his horrible death, there's a guilt-thing at work here, plus reason to cover his backside.