Maya 2012 Tutorial
How to Distribute Objects with Equal Spacing in Maya
Often times you will have multiple objects that need to be distributed evenly in your scene. The Snap Align Objects menu item contains an option to distribute objects. For object alignment, see topic Aligning Objects.
Add three polygon spheres to the workspace (Create > Polygon Primitives > Sphere). Move the objects to random, non aligned locations.
Select all three spheres by shift or marquee selecting.
Choose Modify > Snap Align Objects > Align Objects and include the options.
Click the Distribute icon and choose one or multiple axes to perform the operation.
Click the Align or Apply button to accept the settings.