http://shop.nordstrom.com/ Apparel Vertical Accordion 104 seconds
Nordstrom has one of the smoother accordion-style checkouts we examined - limited to steps for sign in/guest, shipping address, shipping method, and payment.
While there are a few unnecessary distractions in the header (a "Wish List" link and a promotion for gift cards), the main navigation is gone. The biggest improvement for Nordstrom could be made by converting it to a true single-page checkout - not a huge challenge since the individual sections are well-organized already.
The Nordstrom Desktop Checkout complies with 69% of our recommended best practices.