We're in the City of Salem Schools in Salem, VA: http://salem.k12.va.us/
We're going to experiment this summer and develop a pilot that will probably go into effect at some point during next school year.
Would love to hear about your experiences, as well.
I apologize for the quickness of this reply, but I thought it was relevant and goes back to the point I made earlier.
You will find a dozen FREE math games which run on Flash. They will work on an Android or Blackberry Tablet. They will also work on a netbook, laptop or desktop regardless of OS. I found this website about 20 seconds after reading the last reply and googling "math flash games" and choosing the top link.