Episode VI Classic Moments was an image archive on StarWars.com that provided concept art and behind the scenes images from production of Star Wars: Episode VI Return of the Jedi. Accompanied by quotes from production staff, many of these rare images, which were first published in this feature, have yet to appear elsewhere.
Sources
Episode VI Classic Moment - Episode VI Classic Moments Archive on StarWars.com (original site is defunct) (post-2004 site revamp)- Blue Harvest Letdown on StarWars.com (original site is defunct) (pre-2004 site revamp)