Here is one I found but haven't tried yet.
From the BHG Canning Magazine:
Farmer's Market Corn Salsa
4 large ears corn
1c coarsely chopped onion (1 large)
1c coarsely chopped green or red sweet pepper (1 large)
1c chopped, peeled tomato
1 fresh jalapeno chile pepper, seeded and finely chopped
1/2c lime juice
1/2t salt
1/2t ground cumin
1/2t freshly ground black pepper
1. Remove husks from ears of corn. Scrub corn with a stiff vegetable brush to remove silks; rinse. Cut kernels from cobs (do not scrape cobs). Measure 2 cups of corn kernels.
2. In a large saucepan, combine the 2 cups corn kernels, onion, sweet pepper, tomato, jalapeno pepper, lime juice, salt, cumin, and black pepper. Bring to boiling; reduce heat. Simmer, covered, for 10 minutes.
3. Ladle hot salsa into hot, sterilized half-pint canning jars, leaving a 1/2" headspace. Wipe jar rims; adjust lids.
4. Process filled jars in a boiling-water canner for 15 minutes.
Makes 4 half-pints