For Readers:
Abyss & Apex
Aeon Speculative Fiction
Apex Science Fiction and Horror Digest
ChiZine
The Internet Review of Science Fiction
Locus Online
Rogue Worlds
 Sam's Dot Publishing
SFReader.com
Strange Horizons
Tangent Online

For Writers:
Duotrope's Digest
Horror Writers Association
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