Kimball’s Biology Pages: a great general biology resource
Fun videos about the elements from the University of Nottingham.
An interactive photographic periodic table
Videos from Harvard Natural Science Demonstrations
Lots of science-based video games at ScienceGameCenter
A hands-on activity that demonstrates eddy currents
If you're a do-it-yourselfer, check out:
For the latest news in science:
The Why Files: The science behind the news
Science is Fun in the Lab of Bassam Shakashiri
Lots of resources for teachers at the Virtual Middle School Science Library
If you're musically inclined, check out this searchable database of science songs.
Tom Volk's Fungi has lots of facts about mushrooms and other fungi.
Dictionaries:
The Free Dictionary.com
Merriam-Webster
OneLook Dictionary Search
You want facts? Find them here.
There, their, or they're?
Grammar and Style Resources
Lynch Guide to Grammar and Style
Writing organizations:
American Medical Writers Association
National Association of Science Writers
Society of Children's Book Writers and Illustrators