Another idea, 5th now. Some of these have been suggested before I think, but putting them up for a plug anyway! A shield for controlling extra PWM devices or servos, with a battery connector and multiple PWM tie downs.

Still plugging the robotics here - biped walkers are hard with just 6 PWM points.

Well, kind of same as your other post but ok.
I was thinking of a shield for controlling stepper motors.

There is talk about making the DC motor shield so that it uses I2C, that way you can have more motors using more shields.

The sensor board is getting a remake too. so be sure to look for those when they come out, for all your Robot needs.