Here's a good article by Seth Davis on Sports Illustrated.com about the ending of the NC State game and end-of-game foul calls in general. http://sportsillustrated.cnn.com/2007/writers/seth_davis/11/28/hoop.thoughts/index.html
He points out that the referee that called the foul wasn't even in position to make the call, and the referee who was did not call a foul. He also said that when there is a close controversial call in late game situations like that, referees should err on the side of a no-call.
I wouldn't be surprised if Dan Cristman was like Tim Donaghy, involved in fixing games.