But assuming at some point that you do have to sign an NDA, remember that there is no such thing as a "standard NDA". Be prepared to cross things out that you don't agree with, or add extra terms.
It might help you feel better, but unilateral modifications don't hold up in court. Of course, if the other guy agrees to your changes, it's fine. But I think this is why my company has the NDA for visitors on computer screens.
