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difference between mmc and SD memory cards?

Same form factor, one (I think SD, "secure") has extra "features." I believe the root cause for the 2 formats was licensing, not any real technological difference. I think relatively new devices treat them interchangeably, but read your specific manual.
 
I checked my device manuals:
  • Philips Rush SA230 MP3 player: online ads, Philips product brief, Philips manual all refer to SD/MMC. Requires proprietary formatting for the device to read, the card is still readable in other devices. Only used SD.
  • Dell Axim X3i PDA: online ads, reviews say SD/MMC; Dell manual only refers to SD. Only used SD.
  • Cheap USB card reader has a SD/MMC slot.
 
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