The Phoenix by Julia Ecklar is also really good. It makes me sad that there's no good recordings of it and I can't find any covers.
Leslie Fish's "Black Powder and Alcohol" may teach you a thing or two, in case you're ever in a post-apocalyptic wasteland and in need of effective propellants and solvents.
I love filk. Dreaming of strange worlds, listening to a narrative set to music, what's not to love. If you're reading this, you probably love filk too. So maybe you'd like some recommendations for songs for the space age, and more.
I'll extend this list as I think of others.