I noticed that Sony currently has four short stories originally available from Tor. All four are well formatted and have pretty nifty cover art. All four are finalists for the Hugo, Nebula, and/or Locus award.
"Eros, Philia, Agape" by Rachel Swirsky is a Hugo and Locus Award finalist
http://ebookstore.sony.com/ebook/rac...Bargain_FREE_1
"Overtime" by Charles Stross is a Hugo Award finalist
http://ebookstore.sony.com/ebook/cha...Bargain_FREE_1
"A Memory of Wind" also by Rachel Swarsky is a Nebula Award finalist
http://ebookstore.sony.com/ebook/rac...Bargain_FREE_1
"First Flight" by Mary Robinette Kowal is a Locus Award finalist
http://ebookstore.sony.com/ebook/mar...Bargain_FREE_1
I originally read these back when they were on Tor's site, but the spiffy formatting combined with the fact that I never downloaded them from Tor promoted me to pick these up from Sony...hope this helps some folks to read some truly great short fiction.