This recipe may be found in several different places on the Internet, but I love the version on Mennonite Girls Can Cook:
14 - 16 oz of canned salmon, drained
1/2 c. gluten free bread crumbs (NOTE: you can use other things, including cooked gluten-free oatmeal or leftover gluten-free stuffing or even mashed potatoes)
2 diced green onions
1 T. fresh dill
2 T. lemon juice
2 T. mayonnaise
salt and pepper to taste.
1 c. grated cheese (optional)
Mix together well and form into patties. Brown in a non-stick saute pan with about one tablespoon olive oil. About 3-4 minutes per side. This recipe is casein free if (a) your breadcrumbs are casein free, and (b) you don't add the cheese.
Edit (10/20/09): For a grain free version, use grain free crumbs; for example, crumble almond or coconut flour biscuits up to make the crumbs.