SkyView - Virtual observatory on the net generating images of any part of the sky at wavelengths in all regimes from radio to gamma-ray. - http://skyview.gsfc.nasa.gov/
Atlas of Nearby Stars - Experiments in Virtual Astronomy - Introduction, background, methodology, using the applet, results, discussion, conclusion, and references. - http://www.computing.edu.au/~bvk/astronomy/HET603/atlas/html/writeUp.html
Today From Space - The Cosmos - Picture of the day, Hubble pictures, and Chandra x-ray astronomy. - http://science.nasa.gov/newhome/pad/cosmos_today.htm
The Virtual Amateur Astronomer - Information and internet images of the Universe. - http://www.jupiterscientific.org/virtualastronomer/
Now Anyone Can Make a Discovery - Science Tuesday, an article. - http://www.space.com/scienceastronomy/astronomy/virtual_astronomy_011120-1.html