I would consider Zorro, Green Hornet, etc more as Pulp heroes, as they predate comics, and therefor superheroe in general, if you use the bases of Superman being the first true superhero, which is probably debateable.
A fine list! American Splendor is a must have add-on to the non-superhero list. I'd also add:
Tales From The Crypt
Vault Of Horror
Creepshow
Creepshow 2
These were all inspired from the 1950's EC Comics line.
I can't think of any other comic book origin stuff unless you go the Manga route, which would probably quadruple this list.
A fine list! American Splendor is a must have add-on to the non-superhero list. I'd also add:
Tales From The Crypt
Vault Of Horror
Creepshow
Creepshow 2
These were all inspired from the 1950's EC Comics line.
I can't think of any other comic book origin stuff unless you go the Manga route, which would probably quadruple this list.