Ginnugagap, Sigrid Sandstrom, from the Hrönir exhibition
A Vector Alphabet of Interstellar Travel, a short story by Yoon Ha Lee, is online at Tor and it's quite good. Like much of the work of old JLB, it's not a story so much as an exposition of ideas and speculative setting; i.e. it boils down this kind of fiction to the points it truly serves, and at one point pungently comments on the genre in the process; probably the least subtle thing about the piece, but which I quite appreciated.
She's already published quite a bit so I'm looking forward to reading the rest of her stuff soon. Her homepage is here. [And added later: not long after I posted this I ran into another story of hers in Clarkesworld Magazine, Conservation of Shadows.]