I am currently working in the USC Interaction Lab, a lab in USC's Center for Robotics and Embedded Systems that specializes in human-robot interaction. They use Willow Garage's ROS software, so I can draw upon my experience with PR Lite. (They even have a PR2, so I'm not even restricted to having "lite" capabilities!) My current project is described below.

multiple_kinects:
The ROS stack for the Kinect often assumes that only one Kinect is attached to the computer. The multiple_kinects package I made uses modified versions of the files from this stack to support reading data from multiple Kinects and determining their relative positions by calibrating their cameras to the same checkerboard. The eventual goal is to have many Kinects tracking people as they move around in the lab, something Divya and Edward are also working on. When this goal is accomplished, we will put the code in a public repository and I will add download directions to this page. Below is an rviz screenshot of the package tracking the positions and point clouds of 2 Kinects, one in color and one in white.

rviz screenshot