http://www.staples.com/ Electronics Vertical Accordion 79 seconds
Staples has implemented one of the fastest checkouts we bench-marked, doing many things right.
The two-stage accordion has no extra fields or distractions, and is well organized with appropriately layered fields - for example, the address is organized the same way we see it written on an envelope. Progress is made clear by virtue of the layout.
The only source of significant friction is the separate page for login/guest selection. Making guest checkout the default would eliminate that friction and further improve the Staples checkout.
The Staples Desktop Checkout complies with 77% of our recommended best practices.