Colouring
icon_coloring
selectivecolor
phonography_x
chaoticresources PSD tag

Photoshop Actions
Julia Starr (formerly night-fate's photoshop actions)
best photoshop tutorials: 25 coloring actions
khalid ma'ani: actions (no longer online)
thedreamcolours

Fonts
dafont (free)
myfonts (commercial)
fontgarden (free + commercial (very inexpensive, though!))
fonts for peas (free)
Font Squirrel

Screencaps
Ashes to Ashes
nancherrow (defunct LJ comm)
kimi1987
next_july
magique_icon
stormfronticons
tryingtorevive

Top Gear (used for earlier icons)
sundive

The Borgias
rawr-caps (defunct)

Photos
Ashes to Ashes
Radio Times

Top Gear
Radio Times
topgear.com
BBC America Top Gear Site

Miscellaneous
Far Far Away Site


Textures
erniemay
hybrid genesis
fauxism.org (now defunct)
shalowater
urbanstrokes
crazydelight
recap
roserascal
shadedcolor
unpresented
nightstar21
perquisites
yunhe

Miscellaneous
icon_extras (colouring tuts, textures, icon bases)

This list will be updated periodically.