The web browser connecting to a node.js server using socket.io and the netduino using a simple tcp connection to the server. We used a EasyDriver Stepper Motor Driver to drive the stepper motor.
The code can be found at https://github.com/evilmachina/marbleartV2_prototype
Don't forget to change the IP address in TcpLisserner.cs to your instance of the node server.
Have fun hacking!!