For an interesting simple discussion of color in astronomical images try....
http://www.allthesky.com/articles/imagecolor.html#tri
Astronomy Picture of the Day Archive
http://antwrp.gsfc.nasa.gov/apod/archivepix.html
Try this for a list of resources in astronomy education. Each resource is distinctly different - they have been chosen to highlight a wide range of interests.
http://antwrp.gsfc.nasa.gov/apod/lib/edlinks.html
Try ... http://www.newton.dep.anl.gov/askasci/astron98.htm ... for simple answers to questions ...
... and http://www.astronomycafe.net/qadir/qanda.html for more.
Movie Source Archive
An archive of sites from which movie clips and animations are available. If you download a great clip please archive it for us. Sites have a habit of disappearing without warning.
http://www.mysteries-megasite.com/mysterymovies/space-9.html
http://www.solarviews.com/cap/sun/sunb.htm
http://www.arachnoid.com/sky/olbersparadox.html
http://www.astro.princeton.edu/~clark/RSBkgd.html
http://zebu.uoregon.edu/movie.html