I know they've not posted since 10th of July. But their stock is so good, I just had to mention them They've got a bunch of really creative textures, that I love to use all the time [link]
Also! They've got a LOT of great textures, their not crowed or too simple. They are quite creative as well, and I like to use their textures as overlays. They don't just do textures, they also do good tutorials, brushes and gradients (GIMP) [link]
My fav non subbed and active resource provider would have to be ~IQuitCountingStock She has some wonderful model stock. The piece that drew my attention to her and caused me to watch her was this one - [link] and really that whole set of stock images. The pose is great, as is the quality, but the expression is what gets me. She looks angry, yet sad at the same time, unsure... the colors are amazing (red's are awesome) and I can 'see' so many things to do with this one stock image.
has beautiful quality stock, and a nice range of wildlife, landscapes and vehicles. For the quality I believe his work is under-appreciated (although he has only had the account for 6 months, so I guess it's understandable) like this on [link] of a female Mandarin duck with a mere 6 Favourites including one of my own!