As you have probably seen, I wrote a post about my experiment with the Maxim Max520 IC and the Mini6410.
In the future I'm planning to test some other ICs (ADC, GPIO extensions) on I2C and on SPI bus. My goal is to find the best solution for expanding Mini 2440 and 6410 I/O capabilities because I'm sure FriendlyARM board can be very competitive for LAB applications, industrial automations, building automations and robotics.