Personally, I've been bouncing between several projects like a mink on methamphetamine:
- A sword-and-sandal setting for Cepheus Engine, since that ruleset gets lots of Science Fiction love and a lot less for fantasy RPGs.
- A pulp SF setting based on ideas from Fritz Leiber's "A Pail of Air" (which I discovered some time ago was in the public domain due to the peculiarities of American copyright law when it was published in 1951).
- An "open source" take on a Third Imperium-like setting as a way of giving back to--yet again--the Cepheus Engine community.
This is also besides thinking hard about trying to break out of my comfort zone and write a novel. Two possibilities there....
Needless to say, I'm not actually making much progress on finishing anything.
Many years ago I wrote a "Vikings & Dinosaurs" setting for Pyramid magazine, and I think about re-visiting it every now and then. Thanks to Infinite Worlds' banestorm McGuffin, I was able to drop some medieval Norwegians into the South Pacific of a timeline with no K-T extinction, and since it was part of the IW setting you could even have modern-day time travellers drop in and join the party.