Brusheezy is a HUGE collection of Photoshop Brushes, Photoshop Patterns, Textures, PSDs, Actions, Shapes, Styles, & Gradients to download, or share!

Brusheezy is also a community that provides a place for artists to create and exchange any design resources related to Photoshop.

You must make sure you check the license term of each item you download, most of them should be non-restrictive but you should check.