An Atlas of the Universe http://anzwers.org/free/universe/pop
Contains 3D maps of the universe zooming out from the nearest stars to the scale of the galaxy and out to the surrounding superclusters and finally to the scale of the known universe.
Infrared Astronomy http://coolcosmos.ipac.caltech.edu/cosmic_classroom/ir_tutorial/pop
All about infrared astronomy from NASA's infrared astronomy center: Discovery of infrared, what is infrared and infrared astronomy, history, the infrared universe, gallery, activities, discoveries, missions and a lot of links to IR astronomy sites.