Star Wars
Ben's Millennium Falcon, Jacob's Lego Star Wars Models, Lego Star Wars Trilogy, Lego Systems: Star Wars [Official], Millennium Falcon, Pat's Lego Space Craft, The Brunching Shuttlecocks Ratings, The Star Wars Lego Saga
Genom Hacked
Tthemed around the Japanese animated TV series Bubblegum Crisis.
Lego Capital Ships
Offers pictures and information on a spaceship that's under construction.
Legoverse
Terry Kellers space-themed original creations. Includes instructions for many of the models (both as LDraw files and ready to view).
M:Tron Corp World HQ
Renderings and animations of original creations.
rec.toys.lego Set Reviews
The rec.toys.lego Set Space System review archive.
Silicon Psyche
Todd Amacher's original sci-fi epic features various mecha, starfighters, and assault droids built with LEGO bricks.
Space Set Reviews
Set reviews of official Space models from Adequate.com.
The Dark Sun System
A Lego universe created by Paul Gyugyi. Includes some pictures and renderings of original models.