MMC vs. SD

MMC vs. SD: "A very common question on the message boards concerns the difference between SD and MMC as formats. Searching on-line at the time of this writing, a 64MB MMC card will cost between $80 and $100, before shipping. Secure Digital (SD) cards cost more, with current prices ranging between $90 and $250 (!). The question is, what do you get for the extra money when you purchase SD?"