I'm starting to love Twitter like no other. If you follow the right people, you find some really fascinating material, like this article by Sarah Funke Butler from The Paris Review. The rundown: A sixteen year old student wrote a 'survey' on symbolism and sent it out to 150 well-known authors (like our very own July-August mentor, Jack Kerouac, as well as luminaries like Saul Bellow, John Updike, and Ray Bradbury).
The odd thing is that these authors responded. I guess writers just can't keep quiet about their craft, huh? They keep blogs and tweet and stuff nowadays. =)
Check it out. There's actual archival scans of the letters.