Doug Gilford's Mad Cover Site is the most popular Mad site on the internet containing every Mad cover in full color and lots of other great stuff.
Go to http://madcoversite.com/
[This website was taken down by Mr. Gilford in July 2012]
[Reinstated July 20, 2012]
[The website was taken down by Mr. Gilford in September 2014]
[Reinstated September 19, 2014]
[The website was unavailable from February 14 to 21, 2015]
[The website was taken down by Mr. Gilford in February 2016 and replaced by a series of messages pointing to some sort of business transaction]
[Reinstated February 20, 2016]