Some other stuff people might be interested in.
The State of the Platypus. An informal twitter poll on classic debates (link is dead).
Proving the sum of squares formula visually. Appeared in Mathematics Teachers Bulletin, 1993. Hebrew
Finding geometric proofs by cutting and pasting. Appeared in Mathematics Teachers Bulletin, 1998. Hebrew
I once had a plan to say a lot more about this topic. Since I moved to other things all that remains is the juvenilia above.