I been working on a project I call the Lost Book of Magic. In the three years since I released Majestic Wilderlands I ran several campaigns using Swords & Wizardry. Along the way I further developed the rules and background I use to run magic in my setting. The Lost Book of Magic collects all that together much in the same way the Majestic Wilderlands collected my rulings and notes for the campaign as a whole.
One central chapter is the creation of magic items. The system is fairly system. Each item has a cost to create and takes X time. It is fairly expensive and takes enough that players think twice before making it themselves. It also serves as the foundation for the pricing of magic items. Being able to buy magic items has always been part of my campaigns.
I recently completed a rough draft of the chapter and formatted it. You can download it from here. I appreciate any comments. It is a synthesis of what I read in the AD&D DM's Guide, the Rules Cyclopedia, and the prices I developed from GURPS Magic. It currently limited to the list of magic items (and effects) found in the Swords & Wizardry Core Rules.