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Google.com has 610 URLs listed in 526 Dmoz categories.

Octopus macropus
Interesting videoclip of an octopus escaping through a small hole.
http://video.google.com/videoplay?docid=4007016107763801953&q=octopus
Top/Science/Biology/Flora_and_Fauna/Animalia/Mollusca/Cephalopoda

Asterella tenella
A JPEG image.
http://images.google.com/imgres?imgurl=http://bryophytes.plant.siu.edu/images/Asterella_tenella2.jpg&imgrefurl=http://bryophytes.plant.siu.edu/asterella.html&h=754&w=648&sz=103&hl=en&start=2&tbnid=Aa00H0AmTsc6UM:&tbnh=142&
Top/Science/Biology/Flora_and_Fauna/Plantae/Bryophyte/Hepaticophyta/Marchantiales/Aytoniaceae

Asterella californica
A JPEG image.
http://images.google.com/imgres?imgurl=http://www.ucsc.edu/news_events/img/2007/08/liverwort.jpg&imgrefurl=http://press.ucsc.edu/text.asp%3Fpid%3D1485&h=240&w=200&sz=72&hl=en&start=2&tbnid=VnSqYtzdsQ-QxM:&tbnh=110&tbnw
Top/Science/Biology/Flora_and_Fauna/Plantae/Bryophyte/Hepaticophyta/Marchantiales/Aytoniaceae

Life Cycle of a Giardia lamblia
Short video showing how this parasite develops after it has been ingested.
http://video.google.com/videoplay?docid=-965376292862019004&hl=en
Top/Science/Biology/Flora_and_Fauna/Protista/Sarcomastigophora

OpenBiomind
OpenBiomind is an open source toolkit for analysis of gene expression, SNP and other biological datasets using advanced machine learning and pattern mining techniques, and includes traditional clustering, hybrid clustering, and other techniques.
http://code.google.com/p/openbiomind/
Top/Science/Biology/Genetics/Software

Sólymos, Péter
Hungarian scientist at the University of Alberta, Canada. Research, publications and data with an emphasis on malacology.
http://sites.google.com/site/psolymos/
Top/Science/Biology/Zoology/Personal_Pages

Google News: Hurricane Katrina
Aggregated media coverage of the hurricane and its aftermath.
http://news.google.com/news?q=Hurricane+Katrina
Top/Science/Earth_Sciences/Meteorology/Weather_Phenomena/Hurricanes/Past_Hurricanes/Hurricane_Katrina/News_and_Media

Globalchange: Google Groups
Moderated discussion of environmental science, economics, policy and politics, especially as related to global change issues such as climate change, biodiversity, and sustainability.
http://groups.google.com/group/globalchange
Top/Science/Environment/Climate_Change/News_and_Media

SymPy
A Python library for symbolic mathematics.
http://code.google.com/p/sympy/
Top/Science/Math/Calculus/Software

gteditor
A graph editor and tool for sketching graphs and performing some common graph operations developed in Java.
http://code.google.com/p/gteditor/
Top/Science/Math/Combinatorics/Software/Graph_Drawing