Peacefully -- movie screencaps
SummerSkin -- caps by Mari
StripedWall -- hi-res screencaps
OutNow -- hi-res images from the latest films
Hi-Res Hunks -- quality images of pretty men
Hi-Res Hotties -- quality images of pretty women
Supernatural Media -- hi-res pictures from the show
stock.xchng -- quality stock photos
Resurgere Stock -- hi-res stock images

Hybrid Genesis -- resources by Thia
Brush Addicts -- imaging brushes for the masses
Icon Tutorial -- [sometimes] quality iconing tips
DaFont -- every bit of text you'll ever need