Space Carnival week 36 is up at Steinn Sigurdsson blog Dynamics of Cats
My contribution was that new high energy density superconductors are getting us significantly closer to being able to enable all magnetic ground launch into space.
Slenian boondocks talks about an air launched single stage to orbit concept. Although I think if you air launch anything then it two stage to orbit because the aircraft would be the first stage.
Centauri dreams talks about Europa's oxidized oceans