The Maxwell House Haggadah
Now here's the thing that always got me about the assumption behind the Maxwell House Haggadah: you cannot end the seder with a cup of coffee, for the last taste left in your mouth has to be that of matzah, which is only allowed to be supplanted by the taste of the third and fourth cups of wine that follow the Afikomen.
Theoretically, you could sip your coffee before you eat your Afikomen, I suppose, but really, who wants black coffee that late? Most seder meals include meat, and the nondairy creamers that are kosher for Pesach are simply vile. Nevertheless the history and marketing angle behind this Haggadah is interesting.
According to http://www.brownielocks.com/MaxwellHouseHaggadahs.html Maxwell House Coffee was kosher for Passover certified way back in 1923.
The Hagaddah idea came to be from the Joseph Jacobs ad agency, which had the goal of "making make coffee, rather than tea, the drink of choice after Seders," according to http://www.nytimes.com/2012/04/01/opinion/sunday/why-a-haggadah.html?pagewanted=all?src=tp "The resulting Haggadah is one of the longest-running sales promotions in advertising history," amounting to over 50 million copies to date.
One thing I am not completely clear on is whether the first Maxwell House Haggadah came out in 1932, as the New York Times claims, or in 1934, as the Brownielocks article declares. On the side of 1934 is this chronology of Haggadot: http://www.angelfire.com/pa2/passover/haggadah-chronology-timeline.html
image of the Haggadah incarnation in 1934, 1950s and 1998 from http://www.nytimes.com/2011/04/09/nyregion/09haggadah.html