RobotWorx has an article up that showcases various available robots that can aid in packaging and sorting tasks. Motoman's has a series of dual arm robots extremely well-suited for packing applications. Dual-arm robots are extremely precise and dexterous, offering human-like assembly capabilities. The arms can be programmed to work collaboratively or separately. The Fanuc M-1iA Robot (pictured above) is a lightweight and compact robot that is capable of sorting very small items and placing those items in packaging.