I've heard of a few misguided attempts to go after former employees who, supposedly, violated anti-compete clauses, but I don't recall anyone being sued for violating an NDA. I'm sure it's happened, but it's got to be rare. Usually successful companies are too busy building a great product and don't have time to mess around with NDA lawsuits.

I'm curious, can anyone recall a successful lawsuit over a violation of an NDA? Particularly with regard to early stage startups.