I imagine this will be to X-plorers what Fight On! is to Swords and Wizardry. He's taking submissions through March 1, so if you've got some sci-fi goodness in the hopper, send it on in!
Sword+1 is a great blog in and of itself. Mike's the author of Ruins and Ronin a Swords and Wizardry ruleset based on Asian-styled adventuring.