Points in Space 1: S John Ross' space opera tour de force; plus rules for the solitaire game One-handed Emoch
I have played a lot of old-school, tabletop RPGs. I started with D&D. In late highschool and college, I played primarily GURPS. Since, I've played the home-brew Élané, Amber, Adventure, and more D&D. Here is some RPG stuff.
Élané: Maps, campaign notes, and a bevy of characters
The Supers World: Comments on history, the legal system, and so on from my long-running, super-heroic GURPS game.
Heroic Settings: Some maps and commentary from the aforementioned super-hero game.
British Space: A steampunk setting in which I set only a few adventures.
Samuel Mercury: A fairy and a vampire in a world friendly to neither.
Amber: We had a brief flirtation with diceless roleplaying. Here you can find sketches and stories from that campaign.
Dark Dungeons: The warning about occult books that Jack Chick doesn't want you to see.
Metal and Plastic: I collected and painted miniatures for years. Most of my collection is in storage, but you can see some of it here.
Vector Heroes: Originally released in 1999, these paper miniatures of cunning design were my first attempt at vector-graphical, electronic paper minis. They are now available free.
Planet of the Paper People: A monthly column I drew and wrote for RPGnet, 2003-4. Regular helpings of paper miniatures, along with characters seeds, patter, and bonus whatnot.