There's a body of Eight Worlds Fiction floating around, though most is sadly not available on the Web. Much of it consists of campaign writeups, which tend to be unlike any campaign writeups you've ever seen! Other material was written by Paul for various nefarious purposes.
I know from experience that the Eight Worlds is fascinating and seductive, having been a player from 1983-1995. In addition to the universe itself and Paul's GM'ing, I admire the utter simplicity of his rules system. I doubt that any of my character sheets ever extended to the back side of a single sheet of paper.
For sheer bulk of Eight Worlds fiction, my own novel, One Survivor
) and its partly completed sequel, Tainted Gold
probably take the prize. You can read the first third of One Survivor
and all that exists so far of Tainted Gold
online at the links above.
Happy Eight Worlding!