For Readers:
Abyss & Apex
Aeon Speculative Fiction
Apex Science Fiction and Horror Digest
ChiZine
Emerald City
Locus Online
MultiVerse
Rogue Worlds
 Sam's Dot Publishing
SFReader.com
Simulacrum
Strange Horizons
Tangent Online

Writers:
Expressions
Horror Writers Association
Quintamid
Ralan's SpecFic & Humor Webstravaganza
Science Fiction and Fantasy Writers of America
Science Fiction Poetry Association
Speculations

Of Artistic Interest:
Interstitial Arts Foundation
Speculative Literature Foundation