REI
I love REI because they understand ecommerce. They aren't afraid of a CTA (Call To Action) and they know how to point their images at what they want you (visitors and customers) to look at (note the look right at the shoes here).
I also like how you never have to wonder about Free Shipping because their trigger is large and in charge. REI, like most, will play with their Free Shipping trigger through the holiday season. REI has also adopted the Deal of the Day concept or the Woot-ization of the web.
Deal of the Days are great content because they have short and obvious deadlines (one day) and so you are creating content that works great on Twitter and the concept works great on Facebook.
Next generation of this idea is what Screaming Owl does. Screaming Owl is a "social" retailer with an ask before customers qualify for the "Deal of the Day" or week. That qualifying action creates a tribe eager to share their luck or cry over a missed opportunity.
Woot.com is a famous "Daily Deal" site, but that isn't all they are. Woot is really a great content play with a unique voice and great merchandising THEN stunning deals. Stunning deals isn't a movement, but
Woot.com's open, honest and funny approach is. We JOIN movements we don't BUY them :).