Collections of astronomical images, equipment details, publication, and tips and tricks.
http://www.photomeeting.de/astromeeting/_index.htm
Archive of astronomical images made by various amateur astronomers.
http://aida.astroinfo.org/
Planetary and moon images and equipment details.
http://astrosurf.com/cidadao/
Email list discusses equipment, tools, techniques, and science. Includes instructions for subscribing.
http://astro.umsystem.edu/apml/
Includes deep sky image galleries.
http://www.azastronomy.com/
Hints and tips on taking photographs of the night sky using a camera and tripod.
http://www.robson101.freeserve.co.uk/Astrophotography/
Basic concepts, including tracking methods and equipment details.
http://www.geocities.com/CapeCanaveral/Lab/6529/primer.html
An instructional guide for beginning astrophotographers by Olivier Thizy.
http://www.galaxyphoto.com/thizy.html