Mike and Sully don't sign, or at least they didn't last time I was there.
As for autograph sizes, I have found that anything less then 4x4 is really tough, especially for characters like Eeyore (those with big noses)
Rebecca, you can add me as an angel if you need one.
I would have loved to have joined but I don't want to over extend myself. The school and the budget woes have already put me behind.
I can't wait to see everyones work!