[INCOMPLETE]

Images/Caps:

Stargate SG-1 and Stargate: Atlantis:
StargateCaps.com
New Atlantis (now defunct)
Andreas
Dryope

Enterprise:
Star Trek Enterprise Screencaps
Proxima Centauri
Kipli's Gallery

Without a Trace:
Pretty FBI Boys
InFEDels Surveillance

Firefly:
Can't Take The Sky

Battlestar Galactica:
Dark-Thoughts.net (now defunct)
BSGmedia.org

Brushes and Textures:

1GREENEYE Brushes
Aurora Brushes
Hybrid-Genesis.net
dtissagirl: here and here
oxoniensis
sinecure: here and here
teh_indy
Tere
photoshopranger: here and here
Encre
crumblingwalls
dyoselin

Lighting Effects:

teh_indy
flightstarr