How Stuff Works: Comet  
   Informative illustrated explanation of what comets are, what they are made of, where they come from and how to observe them.
   http://www.howstuffworks.com/comet.htm

Small Comets  
   The original discovery and latest news about a new class of interplanetary bodies.
   http://smallcomets.physics.uiowa.edu/

Comet's Long Tail Tickles Ulysses  
   The solar polar orbit satellite observed tail of comet Hyakutake by means of magnetic fields and particle count anomalies. Article from Science News.
   http://sciencenews.org/20000408/fob1.asp

Views of the Solar System: Comets  
   Basic features, data, discoveries, images and sections with specific information on selected comets.
   http://www.solarviews.com/eng/comet.htm

The Solar System in Actions: Comets  
   Basic features and some more information on selected comets.
   http://www.harmsy.freeuk.com/comets.html

Windows to the Universe: Comets  
   General information and data, pictures, details on the most interesting ones.
   http://www.windows.ucar.edu/tour/link=/comets/comets.html

Comet Information and the International Comet Quarterly  
   From the Smithsonian Astrophysical Observatory. News, observations, orbital data, comet names and designations, links.
   http://cfa-www.harvard.edu/icq/icq.html

British Astronomical Association Comet Section  
   News, recent observations, observing information and advice.
   http://www.ast.cam.ac.uk/~jds/

Comet comet comet  
   Overview of comets, as described by a professional comet researcher.
   http://www.ifa.hawaii.edu/faculty/jewitt/comet.html

Canadian Comet Catchers  
   A list of comets discovered by Canadian astronomers.
   http://www3.ns.sympatico.ca/dave.chapman/CanCom.html

Nakano Note  
   Orbit computations for selected comets.
   http://www.oaa.gr.jp/~oaacs/nk.htm

Catalogue of Comet Discoveries  
   Downloadable catalog. Also news, reading list, articles, links.
   http://www.comethunter.de/

Comet Section of Germany  
   News, observations, analyses of current comets, images, archives, links.
   http://www.fg-kometen.de/fgk_hpe.htm

SOHO Sungrazers  
   Images of sun grazing comets from the Solar and Heliospheric Observatory. Also, background, archives, and how to interpret images and report new discoveries.
   http://ares.nrl.navy.mil/sungrazer/

Exploring The Planets: Comets  
   History, orbits, composition, ways comets are studied, relation to meteor showers. Comets Halley, Shoemaker-Levy 9. From the National Air and Space Museum.
   http://www.nasm.si.edu/ceps/etp/comets/

Wikipedia: Comet  
   Encyclopedia entry covers physical characteristics, history. List of well-known comets.
   http://en.wikipedia.org/wiki/Comet

Deep Impact: Small Telescope Science Program (STSP)  
   Resource for telescope observers involved in the Deep Impact space mission to comet Tempel 1. Provides observation campaign data and observer collaboration.
   http://deepimpact.astro.umd.edu/STSP/

Comet LINEAR  
   Offers report and observations of a breakup of a comet in July 2000.
   http://spacescience.com/headlines/y2000/ast31jul_1m.htm?list

The International Comet Quarterly  
   Updated news letter on observation opportunities, designation of names and discoveries. Includes observation data and links.
   http://cfa-www.harvard.edu/cfa/ps/icq.html

Glossary  
   Glossary of comet (and astronomical) terms.
   http://cfa-www.harvard.edu/icq/ICQGlossary.html

Comet Observations  
   Catalogue of images, ordered by comet.
   http://www.theastronomer.org/comets.html

Lists and Plots: Comets  
   Offers updated orbital data, lists and orbit diagrams. Includes near Earth objects and minor planets.
   http://cfa-www.harvard.edu/iau/lists/CometLists.html