One of the main things to consider is the amount of space that you need at your desk. You need a minimum or 36 inches and definitely a depth of 24.
Tug cords and plugs away for a cleaner, less cluttered look.
A cork pin board covered in linen is an attractive way to keep important information within eye sight.
A built in bookshelf with storage is a great way to maximize space.
Soft seating is important, especially in a home office that may be used for more then just work. A sofa will provide a spot to stretch out with a book or watch TV with a few friends. This allows the office to double as a little den or a reading nook.