Volume 1 (issues 1-11) of The Oerth Journal were produced by the Council of Greyhawk, a group of fans meeting regularly on AOL, through email and IRC. These issues were available as PDF or HTML documents. Issues 12 and beyond were released only in PDF.
Issues 12 and 13 contain much of the content from a short-lived "Volume 2" project. At one point these issues were pulled and refactored.
Issues 14 and beyond are produced by a collaborative group connected with the Canonfire! Greyhawk web site. In their words:
The Oerth Journal is an e-zine produced by fans of the Greyhawk Campaign Setting, and dedicated to publishing creative, quality works for the World of Greyhawk setting by TSR. The Oerth Journal is distributed free of charge, and is available at the Canonfire! website.
Issues 19, 22, 23, 24, and 25 are available in two formats - a "Printer Friendly Edition" and a "Tarrasque Edition" with full page backgrounds. Issues 20 and 21 are available only in the "Printer Friendly Edition". Issues 26 and 27 are available only in the "Tarrasque Edition".