Steadman on Thompson’s Passing It took me a bit more searching than expected to find it, but here's an article featuring illustrator Ralph Steadman's reflections on the passing of writer Hunter S. Thompson. Their collaborations were among the best of their kind.
If you scroll down a bit on this message board thread, you can read about alternative comics publisher Gary Groth's brief encounters with Thompson.
The writer Warren Ellis, whose comic book series Transmetropolitan featured a lead character inspired by Thompson, has written a nice piece about the writer's passing for his on-line journal.