I don't know if this is something that belongs here or w/e but hell, it's about time we've had a thread for this.
Post some good resources, references, stores, videos, tips for general use.
A giant, huge pack of Art related books. A good 17 gigs worth of books, references, brushes, screentones and more. A really nice find and extremely helpful. This also contains some NSFW material, mostly artistic and mundane but hey, DL at your own risk. Also some books may be in japanese/moonspeak, good luck with that. Atleast 500 books. Holy FUCK.
Helpful reference site of movable 3d models, helpful for anatomy reference and general use.
For me this is a great source of inspiration.
Shitton of Sai brushes
Various other helpful sites.
Spoiler for list: