Cut tops off bell peppers and wash and remove seeds. Par boil for 10 minutes in large pot of salted water. Drain and set aside.
In a large skillet melt the butter and saute the onions, chopped bell peppers, and celery and Italian sausage in the butter for 5 or 6 minutes. (until vegetables are tender) Add the garlic, parsley, shrimp, cajun seasoning and hot sauce and cook 4 or 5 more minutes. Remove from heat and add salt to taste if needed.
Mix the breadcrumbs with 1 cup of the shredded cheese and add to the seafood mixture. Fold in the crabmeat gently to keep some of the lumps intact.
Stuff the par boiled peppers with the mixture and place in a shallow baking dish. Top with the remaining cheese.
Put about a cup of water in the bottom of the baking dish (enough to cover the bottom of the dish) and bake at 350 degrees for 30-35 minutes.