Blend with SD Shield
Sometimes it helps just adding the tags.....

The Blend is a Arduino Leonardo Chip - 
and as Lady Ada helpfully points out, you need a special SD Library to use this. The advice on https://learn.adafruit.com/adafruit-data-logger-shield/for-the-mega-and-leonardo is everything I needed to get the cardinfo working, especially the     while (!card.init(SPI_HALF_SPEED, 10, 11, 12, 13)) {
part.

Also, the I2C Pins for the RTC Clock are not the "standard" Analog Pins 4 and 5, but D2 and D3 (see http://arduino.cc/en/Reference/Wire)