Looks like a must-have for anyone who uses Photoshop CS4+.
photoshop
Brush Pilot
“The fast and easy Photoshop brush previewer for Mac OS X”
18 PSDs For Mobile Phones UI Design
Ultimate Round Up of Free Photoshop Patterns
2000 Free Photoshop Brushes
Tileables
via @jasongraphix A “collection of free, seamless patterns and textures. That’s about it. They’re designed to be repeated as background images and they’re supplied in the .PAT format for Adobe Photoshop. The .PSD files are included for your own customisations and .PNG’s of the tiles are rendered in each pack so you can use them in other applications.”