I'm working on a new shield for my Arduino for use in robotics and process control. Right now, I have a setup with 6 R/C servos, and am going to add the 6 PWM outputs, 4 analog inputs, and a Microchip MCP23017 I2C GPIO expander. Unfortunately, using I2C takes away two analog inputs. :( I will have three pin headers for all connections, which are used by R/C servos and sensors.
My first project with Arduino is to create a small robot using an Arduino Decimilia as its "brain." :) It's body is one of the media containers CD/DVD media comes in, with the center spindle removed to route cables though.
kool.. im doing something similar with an R2D2 bubble bath casing, its perfect for the job, and the drive and head rotation has been done. i jsut need to get the brain sorted :P