For Readers:
Abyss & Apex
Aeon Speculative Fiction
Apex Science Fiction and Horror Digest

Clarkesworld Magazine

Fantasy Magazine

The Fix

Goblin Fruit

The Internet Review of Science Fiction

Journal of Mythic Arts
Locus Online
Sam's Dot Publishing
Strange Horizons

Subterranean Magazine

For Writers:
Duotrope's Digest
Horror Writers Association
Ralan's SpecFic & Humor Webstravaganza
Science Fiction and Fantasy Writers of America
Science Fiction Poetry Association

Of Artistic Interest:
Interstitial Arts Foundation
Speculative Literature Foundation