I've noticed a rainbow like effect on my new Panasonic 42PE50B. It's difficult to describe but I'll try my best. It appears in scenes with a solid background, where some of the background is covered in shadow. The rainbow effect seems to cover the area between the shadowed areas and the non-shadowed areas. The effect is similar to colour banding, but instead of seeing different shades of the same colour, I see a rainbow like (mostly purpley red though) effect. I've noticed this when watching DVDs (via component) and Sky+ (via RGB scart). Anybody know what's causing this or is it normal for plasmas?