Screencaps and Images
cap_it - A wonderful comm where if you are looking for a screencap out of a movie, tv show, anime, or even video game? They will probably have it.
deviantART - An awesome site for fanart. If there's a character in a fandom you want to fanart of? It's 99% likely to be found there.
Final Fantasy Shrine - A final fantasy website who has excellent caps of the FMVs of FFX, FFX-2, FFIX, and FFVIII along with other cool stuff!
Google! - Really, it needs no introduction
Alanna.net - A glorious website for screencaps of BTVS, ATS, and other shows!
Kingdom Hearts Ultimania - Site with a wonderful amount of screenshots and artwork from all three games. Along with other things about the series.
Mangarun.com - A glorious site that does scanlations for nearly any manga I can think of. For all the scans I get from them, I'm contemplating pledging my life to them.
Fruits Basket Forever - An awesome site for Fruits Basket images. Warning, its in French.
Snowdrop - A site for light haired bishounen characters. If you are looking for an anime guy with light hair, he might be here!
Brushes and textures
A to Z Lyrics
The booklets that come with albums