I've been looking at markets for short science fiction, trying to see which are "prominent" or "highly visible." I used four different filters, which came up with different results.
Markets with stories that received Hugo nominations for 2007:
|Jim Baen's Universe||1|
Markets with stories that received Nebula nominations for 2007:
|Realms of Fantasy||1|
|Writers of the Future||1|
Markets with stories appearing in the Year's Best SF for 2006:
|Jim Baen's Universe||3|
Markets with five or more stories receiving "honorable mentions" in the Year's Best SF for 2006:
|Jim Baen's Universe||20|
|Cross Plains Univ||8|
|Realms of Fantasy||6|
|Escape from Earth||5|
I'm not sure what this does, except maybe to sort out the very busy SF short fiction universe.