Amen. Board games, PDFs, proofs, comps, mass image review and management, oh man... the things you could do with this real estate.

I very much like the idea of physical tokens that are smart enough to interact with the touchscreen. That's a massively cool idea that I most definitely wish I had thought of.

EDIT: Although, too little resolution. This damn rMBP has ruined me for lower pixel density screens.