http://www.target.com/ General Retail Vertical Accordion 118 seconds
Target implements a slim accordion-style checkout plus a separate page for login/guest checkout selections.
The individual forms for Target are well-designed, taking up no more space than necessary. They are also devoid of distractions or extra fields - navigation is removed, the coupon code field is hidden, and there are no duplicate fields.
Further gains could be made by removing the final "review" step, and by adding a default guest checkout view for all users.
The Target Desktop Checkout complies with 69% of our recommended best practices.