Do you believe Tim Donaghy's allegations that other refs helped fix games?

Though the guy's character is certainly questionable, I definitely feel there is validity to his accusations. Even watching game 4 of the recent Lakers-Spurs series, I noticed the refs were coming down extremely hard on the Spurs while letting the Lakers get away with the exact same violations. And we all know how much Commissioner Stern wanted to see a Lakers-Celtics series. Do you think the refs have been fixing games with their officiating? Intelligent, thoughtful answers only please.