The NDP is taking from the Bloc in many parts of Quebec, NR. You can tell by where Gilles Duceppe's tour is going, and what he's saying about whom. It's also unsurprising if you do any statistical analysis of actual election results.
What might explain the discrepancy is that CROP might be commenting specifically in Quebec City. Of course, the Bloc was already down there, so the previous Liberals there might have been Liberal-Bloc switchers. But that one region of the province is quite different from others.
Also as to some other points being made above, in general, there might be something about the Nanos methodology that's turned up slightly different results, but they're all moving in the same direction.
Boom Boom, promise me that you will suspend judgement on what vote splits what from whom in your riding until closer to E-Day. You may actually be living in a riding the NDP can pick up, and you do know that if you make the wrong call too early, you're going to be subjected to merciless teasing here ;-)