>
>Here are my questions: Can I ethically charge them a fee for my source code, even though it was a >custom system I built for them?

If in your contract, you specifically stated that you retained rights to the source, I don't see why not.


>If so, is there a standard method for determining what to charge for source code? I want to do the >right thing here.

That's extremely difficult to do. Perhaps it is time to consult a lawyer and show the company that you are a serious individual. I would not go into this on my own!