I have been using a combination of shelves for jewel boxes and drawers w/sleeves for cd storage. I have used the case logic sleeves, similar to the discsox sleeves since the late 80s. Some of my older, rarely played discs seem to have a "haze" to them on the playing surface when I have removed them from the sleeves to play. This does not seem to affect the playing of the discs, but makes me wonder if I should change sleeves or go to a slim-style case system. Has anyone using sleeves noticed this? They have been in the upstairs bedroom, along an interior wall for most of their lives, under normal household conditions... Thanks, jw