I just came across a great article on internetretailer.com that highlights a range of fulfillment strategies, from highly automated to manual. This article mentions just a few major retailers, such as the Gilt Group, Kohls, Toys R Us, and Macy's, that are making investments in new fulfillment centers and equipment, or leveraging their 3PL relationships, to remain competitive and meet e-commerce demands.
Fulfillment/Delivery - Faster fulfillment - Internet Retailer