Here is a variety of free brush websites. Adding brushes to your photoshop arsenal is very important if you ever want to expand out into selling your graphic art online.Note: If you are downloading brushes for selling your artwork, be sure to read user information. Some websites do not allow you to use their brushes for commercial purposes, while others do. Some brush authors ask that you credit them for the brush you used.
Brusheezy
Brush Lovers
Cheeky Grahpics
Golden Snidget
ChristSeeker37
Imagination
Jen's Sanity
Muse-Driven
Photoshopbrushes
QBrushes
SpyGlass
The Fifth Muse
VBrush