Combine first 6 ingredients; rub mixture over both sides of pork. Heat oil in a large nonstick skillet coated with cooking spray over medium-high heat. Add pork, and sauté 2 minutes on each side or until done. Remove from pan; keep warm.
Add salsa and preserves to skillet, and bring to a boil. Cook 1 minute. Stir in the nectarine slices, cilantro, and oregano, and cook mixture 1 minute or until thoroughly heated. Serve salsa with pork.