Jim Wright's Adventures in Jimland is a set of rules for conducting expeditions into the fantastic worlds of Darkest Africa. It's a massive work, with 35 pages of rules, playcharts, encounter cards and more.
Jim Wallman has written a set of rules called Go!Go!Go!, which he says is loosely based on the computer game "CounterStrike".
Jim Stuht has a nice gallery of trains, planes and automobiles (and robots!) that he has constructed from various toys and models. It a fine source of inspiration for your VSF games.
If you play Full Thrust, you know that checking systems for damage can consume a good deal of game time. Seeking to solve this problem, James F Clay has come up with the idea of "Threshold Cards." It looks like a good solution, and is certainly one that I'm going to try the next time we play Full Thrust.
James Clay has written a fine article on wargaming in the world of the Difference Engine.
For those who don't know, The Difference Engine is a novel by William Gibson and Bruce Sterling that takes the reader to a Victorian world in which Charles Babbage's Difference Engine drives cybernetic steam engines. While I did not enjoy it as much as Gibson's Neuromancer, it still was a good read.