"I've only seen a max of 64 MB ever advertised for multimedia"

Lexar also has a 128Meg Multimedia Card. And, many adds say they will work for SD functions. That is true for some, but not all SD functions. They are priced about the same as SD so there is no advantage in buying them for the KN7000. I guess the moral is, don't try to use Multimedia as a substitute for SD.