We’re not that concerned about genre. Many of us have a fondness for science fiction and fantasy, but we also like literary fiction; and in any case, great flash stories aren’t always easily classified. If you wrote it, and you love it, then submit it.
* Note: Publisher loves horror and says she doesn't get enough horror submissions.
Length: 500-1,000 words
Submission Guidelines: http://flashfictiononline.com/