Did I mention http://www.zappafrenzy.com/ already?
A superb collection of pictures.
If the pictures didn't have the "zappafrenzy" logo in the corner, I would paste them all in one of the corners of the United Mutations Archives...
"ZappaFrenzy is a webpage for collectors and those, who are interested in Frank Zappa/Mothers and related singles. Everything from 7" to 12" maxi singles are covered here. This site is not intended to be a complete discography, but a database with images of labels and covers of every single we can get our hands on."