I've been using a combination of things, starting with a basic plan and consulting sites like
motorcycleroads.com and
motorcycleroads.us. This time I've taped several regional maps together to cover my route area, and I use erasable highighter tape to mark it out. Eventually I'll put the route into my Garmin eTrex Legend. I'll reprint maps for my tankbag holder.
What are your great ideas?