I'll be updating this list of motorcycle travel books as I read them and as people recommend them to me. Here's the latest list and categories:
Really Good Travel Journalism-Writing that just happens to heavily feature motorcycle/ing as transport or character
The foibles of writers who thought, "Hey, it might be fun to do this trip on a motorcycle:"
Ted Simon: Jupiter's Travels
Christopher Baker: Mi Moto Fidel
Personal Narrative, featuring motorcycles
Journeys gone wrong and journeys to heal the heart
Allen Noren: Storm
Neil Pert: Ghost Rider: Travels on the Healing Road
Hilarious Travel Writing, featuring motorcycles
This British writer is a fun, fast read
Geoff Hill: The Road to Gobblers Knob
Geoff Hill: Way To Go
Special-Crossover Market Interest, featuring motorcycles
Educational, even for the layperson
Jim Rogers: Investment Biker
Philosophical, featuring motorcycles
Fiction, but based on the author's real-life experiences.
Robert Pirsig: Zen and the Art of Motorcycle Maintenance
Special Interest: Motorcycling Events
This account of a special event is an obvious audience-grabber.
Ron Ayres: Against the Wind (Iron Butt)
Fast and Furious Motorcycle-centric Writing
The pace of the journey can sometimes carry a story through to success.
Lois Pryce: Lois on the Loose
Glen Heggstad: Two Wheels Through Terror
MOTORCYCLE TRAVEL BOOKS RECOMMENDED TO ME
Robert Fulton: One Man Caravan
Karen Larsen: Breaking the Limit
MOTORCYCLE BOOKS (not about motorcycle travel)
Poetic, featuring motorcycles/ing
Lots of personal experience and intense introspection.
Melissa Holbrook Pierson: The Perfect Vehicle
Full Tilt
Hunter S. Thompson: Hell's Angels: A Strange and Terrible Saga
Philosophical
Ted Bishop: Riding with Rilke

Danny Lyon, The Bikeriders, is an absolute gem. Go to Amazon.com and look for Danny Lyon.
Best, Jochen