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Right now, if you are working on fuerte you only have to roslaunch openni_launch openni.launch this will launch all the nodes related to the kinect. If everything is correct you should se the topics with a rostopic list.

/camera/rgb/camera_info /camera/rgb/image_raw ... A lot more.

You can be sure you are receiving info by typing in the terminal rostopic echo /camera/rgb/image_raw a lot of numbers will full your screen in a few secs.

Open Rviz add a display for the topic you want to display. And you should see the data if everything is correct.

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