Amazon.com is now displaying the cover art for the Season 4 box set of the hit animated television series The Simpsons (large image here) and this may be the first Simpsons box set to feature Ralph Wiggum and Barney Gumble more prominently than the Simpsons themselves. This should be a popular set as this is the season where the greatness of The Simpsons really came shining through. Due out June 15.