Mad Scientists Network is a fascinating place to discover some oddities of science as well as some other interesting facts.
http://www.madsci.org/

Extreme Science is an extensive website full of information from the main branches of the scientific world. Have a look around!
http://www.extremescience.com/

Thinking Fountain is an website with many kid friendly experiments, like growing mold!
http://www.smm.org/sln/

PBS Science and Technology offers parents a chance to correspond lessons with what is on public television.
http://www.pbs.org/neighborhoods/science/

Oregon Museum of Science and Industry (OMSI) online! This is a good place to discover the museum if you can't seem to get to Portland very often.
http://www.omsi.edu/explore/

NASA online!
http://teachspacescience.stsci.edu/cgi-bin/ssrtop.plex

Kodak Science Lesson Plans
http://www.kodak.com/global/en/consumer/education/lessonPlans/indices/science.shtml