Farmer had the blood of a fan flowing strong in him, and his postulations about the retconned interconnectivity of characters in fantastic literature lives on in the form of the so-called Wold-Newton Family of characters and stories from countless authors (some intentional, some not).
My connection to Phil Farmer grew stronger about a year ago, when we hired Christopher Paul Carey as a copy editor at Paizo. Farmer is Chris's favorite writer, the subject of many fanzine articles, annual convocations of fans at the Farmer home, and interesting stories about the man, his lovely wife, and the magical filing cabinet that unearthed new Farmer stories finished by modern authors. Chris Carey's The Song of Kwasin (a sequel to Hadon of Ancient Opar) is one such co-authored treasure. Win Scott Eckert's The Evil in Pemberly House is another. And there are more.
One suspects that though Farmer himself entered Riverworld yesterday, his work will live on here on Earth all the way up to the big alien invasion that destroys the planet.
Chris has written a wonderful remembrance of Philip José Farmer on his blog. I urge everyone to pop over and give it a read.