MakerBot Cupcake-compatible Pololu stepper driver board

I really wanted to move to a microstep-capable stepper driver, and heard lots of good things about the board from Pololu that is based on the Allegro A4983 (http://www.pololu.com/catalog/product/1202). I went through several iterations of my PCB, and here is the "final" version -- well, it's the one that I sent in for prototyping. Note that there isn't any silkscreening on this image because ExpressPCB's proto service doesn't include that or soldermask. I drew the text as traces so there woul