If Pinballnut suspects his wife of cheating maybe he should be talking to a trusted friend/advisor. It has happened to many of us and having a real-world advisor can prevent paranoia and over-reacting. Wiretapping laws will get him jailtime. Don't bug the phone. Many states have laws against video taping someone having sex-even your own wife. Again...jailtime.
If a private investigator is out of the question perhaps this might be the place to start:
http://www.spectorsoft.com/products/SpectorPro_Windows/index.html
When a spouse starts spying it is all over really anyway. Focus on the wellbeing of any children...and end it as soon as possible. Best for everyone. In any event...get some real-world advice from a trusted friend/advisor. We all have one.