Here are two of the four X-Ray lessons now ready to go into production. X-Ray science and impact are forthcoming in about one month. Friedman X-Ray History Lesson November 2012 Moseley X-Ray Tools Lesson October 2012 Let me know what you think!
This list will point you to specific sources for using NASA data organized according to wavelength. http://coolcosmos.ipac.caltech.edu/cosmic_classroom/teacher_research/otherpgms.shtml
Here’s a nice summary of some image processing programs to check out as you consider using NASA visual data with your students. http://wise.ssl.berkeley.edu/edu_making_color3.html