Websites as of January, 2007.  Many may no longer be valid.

  General Astronomy Links (many are organized by multiple topics)--

AstronomyLinks.com <astronomylinks.com>
Astronomy.net <www.astronomy.net/astroguide>
Astronomy Web Guide <astronomywebguide.com>
Astronomical Leage <www.astroleague.org>
Astronomical Web Resources <www.stsci.edu> Massive list of professional sites
Ash's Astro Links (many software links) <astro.ai-software.com>
IMS (huge list) <www.intricate-ms.com>
Calumet Astro Society (click Astro Links on the left) <www.casonline.org>
Eagle Observatory (click Links on the left) <www1.wcf.net>
MacQuarrie's Astro Links <members.aol.com>
Starshine.com <www.starshine.com>

  Lists of Astronomy Clubs & Societies--

AstronomyClubs.com <www.astronomyclubs.com>
ASP: Astro Clubs <www.astrosociety.org>
AL Member Societies <www.astroleague.org>

  Space & NASA Links--

Aerospace (NASA) <www.ksc.nasa.gov/facts/aerospace.html>
Space and Astronomy <www.refdesk.com/space.html>

  Lists of Astronomy Software--

Arnett's Software List <astro.nineplanets.org>
Intricate's List <www.intricate-ms.com>
Sky & Telescope's List <skyandtelescope.com>
AstroTips (astronomy software downloads, reviews, & discussion) <www.astrotips.com>

  Astronomical Calculators On-Line Using Java

 Java for Astronomy <http://users.zoominternet.net>

  List of Amateur Observatories--

Arnett's Observatory List <obs.nineplanets.org> huge list!

  Lists of Commercial Astronomy Products & Vendors; Product Reviews--

Products & Vendors: <astronomy-mall.com
                                   <www.sjaa.net/com.html
                                   <www.astronomy.net/astroguide
                                   <www.astronomy.net/astroguide/manufacturer>
Product Reviews:      <www.best-scopes-n-binoculars.com
                                   <www.cloudynights.com>
                                   <www.scopereviews.com>
Vendor Ratings:        <www.excelsis.com>

 

  Yahoo Groups: Telescopes: extensive lists of astronomy related vendors--
   Note: you will have to join the Yahoo group "Telescopes" in order to access these links.

Telescope Vendor Links:
  <groups.yahoo.com/group/telescopes>

Telescope Mount Vendor Links:
  <groups.yahoo.com/group/telescopes/links/Telescope___Mount>

Accessories Vendor Links:
  <groups.yahoo.com/group/telescopes/links/Accessories___Other>

Astrophotography/CCD Vendor Links:
  <groups.yahoo.com/group/telescopes/links/Astrophotography>

General Page of Astro-Related Links: <groups.yahoo.com/group/telescopes/links>