Dave VW shared his project mbedR3uino in the forum:
The mbedR3uino is a vertical shield adapter for the mbed prototyping platform. It provides compatibility with standard Arduino shields including the pins added to Arduino Uno R3 to make shields more independent between main boards. SPI, UART, I2C, Analog, Digital, and PWM pins are wired to appropriate places for Arduino shields, and battery, CAN pins have extra jumpers. This adapter expands upon the (now extinct) mbed workshop board that already provides Ethernet, USB, and SD for the mbed, with the SD SPI pins available as a set of jumpers.
Via the forum.