The Federation Equestre Internationale website maintains the show jumping course documents for the World Jumping Championships. Pinterest contributor Helene Hewitt has also collected a nice selection of show jumping course examples at a variety of levels.
The United States Equestrian Foundation offers an excellent reference document on jumper course design. This document covers many topics including considerations for course design, course levels, the elements and parameters of a course, difficulty, consequences and results. The document also outlines the steps that need to be taken the day of the show and the actual building of the course including distances between obstacles. Course scoring and different types of jumps are also discussed.
For a high tech solution for course design, JumpingCourseDesign.com offers a digital course design drawing program. This application expands Microsoft Office Visio, Word and Excel to create in scale show jumping courses. Creator Frans Berings has been a course designer for the Royal Dutch Equestrian Federation for more than 35 years, trains show jumpers and their riders and is an internationally certified FEI Course Designer.