Want to know what your money is worth? Check out this site - they track the value of various coinage in terms of its metal content.
Of course, that's the old copper pennies. The government has been quietly counterfeiting its own pennies since around 82' when they became mostly zinc and are just copper plated. The new pennies are worth less than a penny in scrap value.
Just in case you get any clever ideas about sending a pail of old copper pennies to the scrap yard, read this article first. The government recently made scrapping coins a crime that can get you 5 years and a $10,000 fine.
Quite frankly, you'd be better off doing something utterly treasonous -- like selling F-14 fighter parts to the Iranians. Doing that will only get you 2 years at club fed.
There's a lesson here people. Do not scrap a hand full of rolled pennies. Stick to treason, gun running, etc and the feds won't take it too seriously.