Encyclopaedic

Can't Take the Sky - Firefly resource with screencaps
Darkest Hour - Jean Grey site
GateWorld

Images

Oxoniensis Art - various screencaps
But Why is the Rum gone
Puddle Jumper - Stargate Atlantis wallpapers
Stargate Caps
Cap It! - various screen caps
Sci-Fi & Fantasy Galleries - Stargate images
Multipleverses - various photos and screencaps
Screencap Paradise
Veronica Mars Caps
Sparklies Gallery - Heroes, Lost and the Office
Screencaps.org
fractured simplicty
Stargate Screencaps
The Sarah Connor Society
Gateworld
Atlantica

Misc

Sindarin - learn to speak Sindarin :)

Scripts

Indiscripts - Enthusiast - fanlisting admin script
SQL Tutorial - joins
The New Place - Captivate 1.0 - gallery script
Dodo's Script Collective