“OK . . . that makes 2 of you. But I really think capacity is the issue, not physical size of the card.”
With the larger card(full sized vs micro) comes higher maximum capacity. I guess it might be interesting to have a player with two micro SDHC card slots rather than a single SDHC slot. Someone did point out that micro SDHC cards are too small to be conveniently handled and are much more easily lost than full sized SDHC cards.
Notice that there aren’t any digital cameras(besides cameraphones) that have a micro SDHC card slot. It might take a while after the first full sized SDXC cards are out before micro SDXC cards become available.
