How can I give an array of objects a variety of colors? I would like to give the objects in an array (using array modifier) different colors.  Right now the array of objects is just one color, and i would like to give each member of the array a different color, using a gradient.  Is this possible?  I have tried using the Particle Info node to no avail.

Thanks!
I think you need to apply your array modifier, and then separate by loose parts in edit mode.  Press P&gt;loose parts to do this.
Add an object info node to your material, and use the random output. This will assign each object assigned the material a color from the gradient.
A basic setup would look something like this:

This is an example of the effect with an arrayed Suzanne with setup shown: