HBS Publishing: Product Detail Display
See how the Harvard Business Review applies the principles advocated by some the writers it publishes. Add this repurposed, refreshed (and slightly more expensive than the $5.50 original) article to the shopping cart. Then check out and see the clever upsell attempt to a package of three articles. I have reluctance to shell out $16 for 32 pages though (and one of its pieces can be found elsewhere for free.)

04/26/01 update: Jon Udell already had shown some sites routinely sell what's been published for free elsewhere.