A larger (but not perfect) photo of the Doritos ad can be found here. The bag reads:
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Unleash the spirits at snackstrongproductions.com and see what else has come back!
GHOSTBUSTERS THE VIDEO GAME
Available for the PLAYSTATION 3 computer entertainment system, Xbox 360 video game and entertainment system, and PC.
Ghostbusters TM & copyright 2008 Columbia Pictures Industries, Inc. All rights reserved
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(thanks in part to you guys for some of the transcribed text)
As for the diaper ad idea, that's already been done, sort of. Remember that Peebusters commercial posted over at Proton Charging last month?