These are websites that I have found that are fun and educational.  Check back periodically for new additions. 

www.funbrain.com
www.brainpop.com
www.kidzone.ws
www.multiplication.com


http://www.thenakedscientists.com/HTML/content/kitchenscience/exp/electromagnet/ - Shows how to make an electromagnet


Rocks and Minerals websites
http://sln.fi.edu/fellows/payton/rocks/create/index.html - shows how each rock forms

http://www.cotf.edu/ete/modules/msese/earthsysflr/rock.html - Great diagram of the rock cycle

http://library.thinkquest.org/J002289/index.html - On the left side of the webpage, check out "Fun Activities", there are some cool things there. 

http://volcano.und.edu/vwintl/vwintl.html - BEAUTIFUL pictures of erupting volcanos

http://www.fullscreen360.com/mt-st-helens-compare.htm - GREAT 360 degree images of Mt. St. Helen comparing it from 2003 - 2006

http://hvo.wr.usgs.gov/gallery/kilauea/volcanomovies/ - mini movies of volcano eruptions