This panel will help you to set evenly space between selected layers & folders.
How to Install: http://uberplugins.cc/help/how-to-install-photoshop-extension/
Supports
What makes this a better option that Photoshop's built in spacing distribution tools?
The distinction is the space between the objects being equal, not just equally spacing the centers of the objects. This is only useful if the objects you are distributing have different widths.