First, it was USB keys that gained a capacity monitor. Now, A-Data has announced an SD card that comes with a tiny LCD display that shows how much storage is still available. The BCD-SD card lineup which comes in capacities up to 2GB and up to 80x speed, uses power from the host system to power and update the LCD display. When you take the card out, the display information is maintained.
Pricing and availability information was not disclosed.