I finally broke down and ordered Absolutely Mad - a reprint of just about everything that ever appeared in Mad Magazine - ever - on one DVD-ROM.I can't begin to recommend this highly enough - especially if you were a fan of the magazine in the 60's and 70's (it's astounding how many of the jokes and parodies I remember by heart from this era).
The original pages reprint amazingly well in PDF format, especially the "comic-book" issues from the 50's. (For the uninitiated, Mad started life as a color comic book with a sublimely hilarious look and feel that was largely the influence of writer/layout artist Harvey Kurtzman and a handful of masterful cartoonists).
The reprints are complete - so you get the ads and everything. For the price ($33 at Amazon) - you can't go wrong.
Update: Forgot to mention a few other nice features. Al Jaffee's fold-ins have been reproduced so that they "fold" automatically with the click of a mouse. Also, much (all?) of the Super-Special material is included - so you get to see the controversial political posters from the Nixon/Vietnam years, and all those stickers ("Up with Miniskirts" and the like).