I had the DVD-ROM that GITCorp produced about four or five years ago. It had every issue in PDF form from the debut of MAD in the 1952 all the way through 2006. I believe I paid $39.95 for it (might have been even cheaper - on sale when it first came out). It is an amazing thing. Sadly, GIT went out of business a few years ago so finding a copy for a reasonable price is difficult now.
Martin - you keep referring to your DVD-ROM in the past tense. Did something happen? I have the CD-ROM set that has every issue up through around 1998 or 1999.
As for my recollections of MAD: I actually preferred Cracked mazagine (spelling intended) over Mad in the 70's. That was primarly due to the art of John Severin. However, there were a few issues of Mad that I remember quite well:
The Bicentenial issue that had a special pull out insert called "MADDE" which was supposed to be a 200 year old version of MAD.
The Jaws issue with the fantastic cover of the shark going "Yecchh!!" at the prospect of eating Alfred E. Nueman. I believe that Steven Spielberg owns the original art to that cover.
The Star Wars issue (with the parody of the first Star Wars movie).
And I was at an antique mall this past weekend and I found a bunch of early 70's issue of MAD. In that lot was the famous issue #166 which I purchased for $5. If you are not familiar with that issue, look it up!!