I missed this one before, when it was announced at Electronica: the Uno SPE Shield, created by Arduino and Microchip working together. It turns out, though, that it wasn't available back then. And it ...

This kit is now discontinued. We've upgraded the Adafruit Motor Shield v1 to v2, with stacking-support and higher-current motor drivers, Please check out the v2 shield - its much better! Here is a ...