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PCDan -- good points. I think at some point size has to be one of the considerations, because there are differences (I believe) between cards, cereal box backs and posters, etc.
JK -- if size is the only, or primary, determining factor, then you are correct, those postcards are clearly cards. Very nice cards.
Opinions will differ as to where one draws the line for how big a "card" can be. I know the Don Mattingly poster that was hanging in my room as a kid was not a card. But is a Kashin a card? If it isn't, it's a card-sized premium. Is a 1967 Topps Pin-Up a card? If it isn't, it is a card-sized poster.