Eric Cook let me know about this.
It's so interesting I think I am going to actually go back to the beginning of its lifetime and go through all of the posts....
In Centauri Dreams, Paul Gilster looks at peer-reviewed research on deep space exploration, with an eye toward interstellar possibilities.
SF Novelists is a new group blog by dozens of science fiction novelists, where they're talking about the work of being an sf writer -- the nitty gritty of writing, managing your career, and all the minutae of life in a very strange trade indeed. The contributor list is incredibly impressive, too.