LiveScience
This site contains science, health and technology news.

ARKive (Science/Biology)
Images of life on earth. ARKive is working to create the ultimate multimedia guide to the world’s endangered animals, plants and fungi.

Biology-Online
A great resource for all your biology questions, complete with a forum of experts, articles, tutorials, books and directories.  An interactive site for all of you biology enthusiasts, utilizing a wiki-type dictionary for the study and discussion of biology terms.

Science Magazine (available online)
American Scientists
Nature
New Scientist
Science News
Scientific American