It's a little early to mention this, since the code isn't finished, but I can't wait.
Take a look at this cool product that will make it very easy to let the robot control code talk to an SD memory module:
http://www.chipdos.com/
I have always been annoyed that you have to recompile the control program to implement changes to an autonomous program or script. Using this device, you can use short text strings to specify the steps of an autonomous script, and simply edit the file on the SD module connected to your PC, plug the SD back into the RC, and off you go.
I am going to use the SPI interface to talk to this thing, since in the RC environment a synchronous protocol is easier to deal with than async. In this case it can be done with bit-banging on 5 digital I/O pins.
Another thing, it runs on 3.3 VDC, so make sure and have a regulator on hand. Even though the power supply is 3.3 volts, it can interface with 5 volt control signals.
I will post more as I figure it out.
Jim