The Urashima Effect, by E. Lily Yu
This is Why We Jump, by Jacob Clifton
Free-Fall by Graham Templeton
Mongoose by Sarah Monette and Elizabeth Bear. (Originally in Lovecraft Unbound, and I gave it a good review after reading it in Strahan’s ‘Best Science Fiction and Fantasy of the Year Volume 4, but don’t read the review before you read the story!
Dead Men Walking by Paul J. McAuley. (Originally in Asimovs, March 2006, and which I noted was ‘A good addition to an excellent series of (Quiet War) stories’.