Comets in the Yahoo! Directory

Cometography.com
Gary W. Kronk 's comet chasing guide for stargazers provides information about current and future comets, catalog of periodic comets, information about the orbits of comets, as well as profiles of memorable comets of the past.
cometography.com
Gary W. Kronk's Comets & Meteor Showers
Comet and meteor shower facts and viewing calendar, professional and amateur observations, and historical research compiled by Gary W. Kronk.
www.meteorshowersonline.com
JPL Comet Observation Page
Includes recent news, observations, and images of comets. Also provides some generally accepted definitions for terms related to cometary astronomy.
encke.jpl.nasa.gov
NSSDC: Asteroids and Comets
Collection of asteroid fact sheets, images, and mission information from NASA.
nssdc.gsfc.nasa.gov/planetary/planets/asteroidpage.html
International Comet Quarterly
Information regarding news, observations, orbital data, designations and names, and more regarding comets and related topics.
cfa-www.harvard.edu/icq/icq.html
Views of the Solar System: Comet Introduction
Learn about the small, fragile, irregularly shaped celestial bodies composed of a mixture of non-volatile grains and frozen gases.
www.solarviews.com/eng/comet.htm
Comet McNaught Photo Gallery
Spaceweather.com offers a gallery of images, submitted from around the world, capturing Comet McNaught (C/2006 P1) in the January sky.
www.spaceweather.com/comets/gallery_mcnaught.htm
Comets and Meteors Workshop (CMW)
Working with members all over Poland to collect and analyze observational data that deals with meteors. Also in Polish.
www.astrouw.edu.pl/~olech/pkim.html
Comet 1999 H1 (Lee)
Steve Lee, an Australian amateur astronomer, recounts how he discovered the comet.
www.aao.gov.au/local/www/sl/comet.html
Comets - Sky & Telescope
Collection of articles addressing how to estimate a comet's brightness, how to photograph one, and how to report a comet discovery.
www.skyandtelescope.com/observing/objects/comets
Comet Holmes Photo Gallery
Comet 17P/Holmes shocked astronomers on Oct. 24, 2007, with a spectacular eruption, becoming a naked-eye object in the evening sky. See photos submitted from around the world.
spaceweather.com/comets/gallery_holmes_page21.htm?PHPSESSID=kqt3697u1ibcd3n...
Catch Comet McNaught Now
Sky & Telescope article about when your best opportunities to catch Comet 2006 P1 McNaught in its full glory are.
www.skyandtelescope.com/observing/home/5133461.html