That's a good question. I don't think so, not in the DC area at least. They are standard around here. I think its expected that you have, and will sign a new one with the new employer anyways.
During my my interview process one of the potential employers even asked to see any non-compete and NDAs that I had with my current employer, before they would move forward. Because they want to make sure they are in the clear too.
I suppose it could hurt in some situations, but I feel its best to be open and honest about the situation. If you are changing careers, you may be safe to not bring it up, but otherwise at least talk to your own lawyer.
During my my interview process one of the potential employers even asked to see any non-compete and NDAs that I had with my current employer, before they would move forward. Because they want to make sure they are in the clear too.
I suppose it could hurt in some situations, but I feel its best to be open and honest about the situation. If you are changing careers, you may be safe to not bring it up, but otherwise at least talk to your own lawyer.