Here is another reason to have your attorney read your NDAs. I have seen companies try to throw ownership assignment provisions in their NDA. This is not the standard provision that says the disclosing party owns what they disclose, but a full blown assignment of new materials created. This is a problem if you are a consulting organization and are in the sales dance with a potential customer. These NDAs provide assignment of those initial items you create without a written contractual obligation for you to get paid.
That does not put the consulting organization in a very good negotiating position down the road.