Thanks to Bibliophile Stalker I found a set of interview excerpts running from 1987 to 2001, with Douglas Adams, Isaac Asimov, Arthur C. Clarke, J. G. Ballard and Kurt Vonnegut. I recommend them to anyone wanting a look into their worlds and ours.
If that interests you, and Ballard's thinking in particular, or simply life, I'd also point you to this post at Science Not Fiction on a possible hidden meaning in Pixar's films.
On the subject, mainly for 40K fans, is Auberon's interview with Dan Abnett at Digital Waaagh!, which focuses on Abnett's contribution to the shared universe.
And following up all of that, you might well like this, a stimulating post and discussion at Astrogator's Logs, on the nature of fantasy, coincidentally quoting Douglas Adams.