MicroObservatory
• Optimize an image's brightness/contrast automatically, by either linear or logarithmic scaling. • Colorize images using several false color tables. • Invert an image's color table. • Increase image contrast and detail using "sharpen" filter. • Reduce the noise in an image. • Manipulate full screen magnification. • Show image information for individual pixels by cursor placement.
http://mo-www.harvard.edu/MicroObservatoryImage/ - Details

Observation Manager
Observation Manager is a free and open logbook for (amateur-) astronomical observations. It's written in pure Java and runs on every plattform supporting Java 1.4 or higher. All logbook entries made in Observation Manager are stored in the free and open COMAST XML Schema.
http://observation.sourceforge.net/en/ - Details

Little Windows Helpers
Yes, it is possible to write small Windows programs - but who cares? If you do, have a look at these programs written in PureBasic. They do not come with an installation program, and they do not make any entries in the Windows Registry. Just unzip the files to a program folder, and make a shortcut.
http://home.mnet-online.de/horst.muc/win.htm - Details

Amateur Astronomy
1369 manually selected sites about Amateur Astronomy
http://www.cbel.com/amateur_astronomy/ - Details

Gerald Rhemanns Astro Studio

http://www.astrostudio.at/ - Details

Gary Kronk's Comet Page

http://cometography.com/ - Details

Tsunami Hazard from Sub-Kilometer Impacts

http://www.nai.arc.nasa.gov/impact/news_detail.cfm?ID=123 - Details

Tsunami Risks From Asteroid Impacts - New Scientist
Simulations reveal the global risks of the killer waves created when asteroids smash into Earth's oceans – size matters, but impact location is crucial
http://space.newscientist.com/article/dn9160-tsunami-risk-of-asteroid-strikes-revealed.html - Details

Impact Geology, Chemistry & Physics

http://palaeo.gly.bris.ac.uk/Communication/Brana/impact.html - Details

SL-9 The Impact - NASA

http://nssdc.gsfc.nasa.gov/planetary/impact.html - Details

Chicxulub Impact Event
Explores the Chicxulub impact event and the Cretaceous Tertiary mass extinction.
http://www.lpl.arizona.edu/SIC/impact_cratering/Chicxulub/Chicx_title.html - Details

Terrestrial Impact Craters & Their Enviornmental Effects
A series of educational pages that discuss many aspects of terrestrial impact craters and their environmental effects.
http://www.lpl.arizona.edu/SIC/impact_cratering/intro/ - Details

Shoemaker - Levy 9 Post Impact Q&A

http://www.isc.tamu.edu/~astro/sl9/cometfaq2.html - Details

Comet Shoemaker - Levy 9 Impact Homepage (JPL)

http://www2.jpl.nasa.gov/sl9/ - Details

Shoemaker - Levy 9 Jupiter Impact

http://www.solarviews.com/eng/impact.htm - Details

Web-Based Asteroid Impact Simulator
How new technologies are modifying our way of life
http://radio.weblogs.com/0105910/2004/04/08.html - Details

Simulation Of Comet Impact With Earth
Real (not reel) deep impacts: Sandia scientists predict what an asteroid strike would look like, really.
http://www.sandia.gov/media/comethit.htm - Details

Catastrophism
Catastrophism: Pib's interest in astronomical catastrophism, especially during the Holocene
http://www.pibburns.com/catastro.htm - Details

list of identified impact craters on Earth (plain text)

http://www.xs4all.nl/%7Ecarlkop/kraters.html - Details

The Earth Impact Database

http://www.unb.ca/passc/ImpactDatabase/ - Details