Coincidentally, the world lost Arthur C. Clarke recently. He wrote the story "Childhood's End," on which 2001 was based, and later wrote the novelization of the movie, as well as at least two sequels. What little I've read of his work suggests it was of the "speculative fiction" genre.
Two other authors I would recommend are Phil K. Dick and Neil Gaiman (I'd love to hear Krista interview the latter on the topic of "New Mythology"). Dick came very much out of the pulp tradition of the 50s, but his ideas center on the notion of identity and reality. Gaiman knows as much about world mythologies as Joseph Campbell, and applies it with a light touch in his work. I recommend his _American Gods_ in particular.
More information about text formats