Below is a list of student friendly websites. If you are looking for a specific subject just look under the red headings. If you have found a website that is a good learning tool and would like to share it, please e-mail me with the link to the website! Enjoy!
Data Analysis and Probability: http://www.internet4classrooms.com/grade_level_help/skills_fourth_4th_math_data_analysis_and_probability.htm
Kid's Mysteries: http://kids.mysterynet.com/
Storyline Online: http://storylineonline.net/
Physical Science: http://www.internet4classrooms.com/skills_4th_science.htm#physical
Time For Kids: http://www.timeforkids.com/TFK/index.html
Catch The Spelling: http://www.manythings.org/cts/