Virtual Observatory - SkyView http://skyview.gsfc.nasa.gov/

All The Sky http://www.allthesky.com/

Digital images of the night sky.  Constellation photos point out interesting objects in the constellation.

StarDial http://www.astro.uiuc.edu/stardial/

Nightly photographs of a patch of sky, raw and ready to be used.

Astronomical Databases.

NED - NASA/IPAC Extraglactic Database http://nedwww.ipac.caltech.edu/

SIMBAD - http://simbad.u-strasbg.fr/Simbad 

DSS - Digitized Sky Survey http://archive.stsci.edu/dss/ 

Aladin Interactive Sky Atlas http://aladin.u-strasbg.fr/aladin.gml 
Aladin is an easy way to retrieve images.  The atlas interface can run from the site or from software downloaded to your own computer.  I recommend downloading the software to run from your computer.

Sloan Digital Sky Survey http://cas.sdss.org/dr3/en/tools/

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