Noupe has compiled an amazing collection of literally thousands of the highest-in-demand Photoshop tutorials, brushes, patterns, textures, actions and .PSD downloadable files.
"Due to this phenomenally vast amount of textures, brushes, patterns available, you can now add dirt, rust, floral effect, swirls, mold, oil stains in your artworks and photos to give them an aged, damaged, dreamy or any look you want."
This incredible list is broken down by category for easy navigation. Check it out.
(P.S. When you're done combing through that list, you may want to wander over to WonderHowTo's Photoshop tutorial library as well).