This site is an addition to my blogroll. It is a site that you should visit on a regular basis. It is, in fact, my starting page ( you know, when FireFox loads).
Call it APOD. It’s run jointly by NASA and Michigan Technological University.
Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.
This site is changed every day, and every day it’s a new view of heavens – usually with some connection to current events. Today was the Cat’s Eye Nebula

An interesting feature of this site (and one that has won it Internet awards) is the use of hyperlinks. By clicking on the right thing, you can find out more about NGC 6543, the Hubble Space Telescope photos, or planetary nebulae.
And all this besides the fact that the photography is amazing.