Add-on to snap FK bones to IK bones ??

Is there an add-on (or built-in tool in Blender) for 2.66+ that would align/snap selected bones to active bones? Specifically FK bones to IK bones in Pose mode. Thanks.

Thanks revolt_randy, I’ll try to piece it together. I am surprised no one put it together for a complete add-on. I don’t use Rigify :confused: Will it work with custom rig?