As a general proposition, someone being asked to sign an NDA in a situation like this will want to look for provisions such as:
1. a requirement that all confidential information be reduced to writing and marked as confidential (to reduce the chance of the discloser later claiming "but I told you that, and I told you it was confidential!");
2. explicit exclusions from confidentiality, e.g., things published, things independently developed or received from others, etc.;
3. a time limit on the confidentiality obligation.
Self-cite here: For a detailed discussion of various types of clauses in NDAS, see http://www.oncontracts.com/confidential-information/. It needs some stylistic editing (I was experimenting), but it includes:
* colored-symbol "ratings" indicating my personal view of how acceptable-versus-dangerous various clauses usually are;
* extensive commentary in a MAN-style format;
* links to actual contracts in the wild that contain similar language.