
Joby Taffey has a demo of an SPI-based Sparkfun LED Matrix using the Bus Pirate.
You can get a Bus Pirate for $30, including worldwide shipping at Seeed Studio. Adafruit also has the Bus Pirate and probe cables in stock and ready to ship.

Joby Taffey has a demo of an SPI-based Sparkfun LED Matrix using the Bus Pirate.
You can get a Bus Pirate for $30, including worldwide shipping at Seeed Studio. Adafruit also has the Bus Pirate and probe cables in stock and ready to ship.