I'm reading "The Anubis Murders" by Gary Gygax and "Almuric" by Robert E. Howard.
The first, while not perfect, is every bit as entertaining as the Gord the Rogue books and displays a novelist more comfortable with the craft than is evidenced by his earlier series.
"Almuric" is Howard's only novel, and allegedly the later bits show evidence that it may have been finished by another author (probably Otis Adelbert Kline) after his suicide. So far it is _considerably_ better written than the Burroughs novels that clearly inspired it, and is at least as good as any Kline I have read.
Otis Adelbert Kline was last published in the 1960s, and is all but forgotten today. But he was Robert E. Howard's agent and a member of the original editorial staff of Weird Tales. Like Burroughs, he wrote books set on Venus and Mars (ERB's "Carson of Venus" was a direct response to Kline's "Planet of Peril," itself a response to the John Carter of Mars books).
I've been on a bit of a Kline kick recently, and even discovered a complete novel ("The Secret Kingdom") written by Otis Adelbert and his brother Allen in three 1929 issues of "Amazing Stories" we happen to have in the office.
It's nice to have a complete archive of one of the greatest sf magazines in history thirty feet from my desk. I need to make better use of that...
--Erik