If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.
Diaspora
Distress
Quarantine
I haven't read the short story collections close enough together to rank them, but I'd generally recommend them
Permutation City
Zendegi
Schild's Ladder
Teranesia
Didn't finish (more physics than I could appreciate)
The Clockwork Rocket
Incandescence