Supermax prisons have always struck me as evil institutions. This New Yorker article on solitary confinement is subjective, but also offers various pieces of research to support its claims.
I've often been inclined to write letters to inmates in solitary, although I hesitate to reveal my street address. Maybe someone could set up an email-to-snail-mail gateway like this one, but free, and people could volunteer to write to inmates. I wonder how much it would help.