There are ways, but really it isn't worth it (IMHO). There are sections of US Code that allow you to charge a reading fee of up to $500 dollars per email, but it costs you to pursue it and very often, the spammers are fly by night operations and you will never see a dime. Aside from reporting them to their ISP's or reporting it to organizations that are dedicated to fighting spam, there really isn't anything you can do unless the email is fradulent (pyramid schemes, nonexistant products, child porn) because law enforcement pretty much won't be interested.

Good luck fighting the fight.

Neb