Astronomy Picture of the Day Archive

Wow.  Astronomy Picture of the Day (APOD) is originated, written, coordinated, and edited since 1995 by Robert Nemiroff and Jerry Bonnell. The APOD archive contains the largest collection of annotated astronomical images on the internet, and even if you don't check this daily, it is something you should give at least five minutes of your time to.  The imagery is beyond beautiful, the facts are informative, and the database is HUGE.  Thanks for the tip AZ, this site is filled with amazingness.