1. To prepare salsa, combine the first 6 ingredients in a blender; process until smooth. Set aside.
2. To prepare fish, combine flour and cornmeal in a shallow dish. Combine 1 tablespoon water and egg white in a shallow dish, stirring well. Sprinkle both sides of fish evenly with salt and chili powder. Heat oil in a large nonstick skillet over medium-high heat. Dip fish in egg mixture; dredge in flour mixture. Add fish to pan; cook 2 1/2 minutes on each side or until fish flakes easily when tested with a fork or until desired degree of doneness. Serve with salsa.