Superman: The Man of Tomorrow
Letters of Note is the sort of blog I’d love to read regularly, but they stuff they post is involved enough that it doesn’t fit into my typical casual reading routine. I think I’d find myself just added almost all of the letters to Instapaper and then never getting back to them. Maybe with a Kindle or Rumored Apple Tablet™ I’d read them on the Metro or something.
The above-linked article is a letter by Jerry Siegel detailing an early pitch for Superman.