Add a small amount of sugar to counteract the excess salt. Begin with small amounts so you don't overdo it. Quit adding sugar when you no longer taste the saltiness but it has to be done with very small amounts so you can guage properly when to quit.
If you oversalt chili or soup or anything like that, take a couple potatoes, peel them, cut them in big chunks (that can be fished out later) and put them in the pot. They'll soak up the salt in no time. When all else fails - add a couple more cans of tomato sauce/paste, a can of beans and another pound of browned hamburger. Then you'll have enough to freeze.
read above and used a large potato, cut up, and a little sugar at a time. Worked like a charm :)
Sometimes if you add chunked up potatoes to soup they seem to absorb some of the salt. I don't know if this would work for chili, though. You might just make another batch, this one without salt, and add it to the first one. Chili freezes beautifully.