University of Colorado
University of Colorado: Physics 2000: X Rays
Here's a really simple demonstration of a fluoroscope. There are links to more information about the uses of X-rays as well.
PBS
Pbs Learning Media: Science Now! A Picture Is Worth
A video clip asks students to explain how X-ray images communicate information. This is one in a series of creative writing prompts. [0:32]
Wolfram Research
Wolfram Science World: Rontgen, Wilhelm
This site from ScienceWorld provides a very short biographical sketch of Wilhelm Rontgen (1845-1923 CE) and describes his most notable scientific discoveries and contributions.