PASP Publications of the Astronomical Society of the Pacific
http://www.journals.uchicago.edu/PASP/
Lots of resources for educators.

Astronomy Magazine Kalmbach Publishing.
http://www.astronomy.com/
A rich site, full of astro-info,the latest news, an "observer's guide," and more links.

Sky & Telescope Magazine Sky Publishing.
http://skyandtelescope.com//
The magazine and more, plus a ton of links! One of the most comprehensive astronomy sites on the web. Includes Sky Publishing's on-line catalogue. Also, software, product reviews, news etc.

Astronomical Journal
http://www.journals.uchicago.edu/toc/aj/current
Editorial Office: University of Washington, Department of Astronomy, Box 351580, Seattle, WA 98195-1580

Astrophysical Journal
http://www.journals.uchicago.edu/toc/apj/current
The University of Chicago Press, 5801 S. Ellis Avenue, Chicago, IL 60637

Mercury Magazine
http://www.astrosociety.org/pubs/mercury/mercury.html
"...communicating astronomy to the general public."