Hawaiian Astronomical Society: Caldwell Objects

Absolute Astronomy: Messier Objects

Spacewatch: learn about what's up

Sky & Telescope: monthly commentary

Astronomy for Children

US Naval Observatory Data Services: calculates times of astronomical events for any given day & location

Observing the Heavens Above!

Award winning daily science radio series with a variety of articles, teacher resources, kids stuff, etc.

Phil Harrington's StarWare, advice and information page for amateur astronomers

Astronomy 101 portal: for high quality resources of images, activities, news, notes, etc...

NASA's StarChild site: for young (and old) astronomers.