Mouse Skills:

Mousing Around

Mousercise

Mouse Practice Skills

Mouse Skills - Tutorial

Proofreading - 4th Grade

Proofreading - 5th Grade

ABCya Spelling Bee

Grammar Gorillas

Scholastic Math Maven's Mysteries

Fun Brain Math

Number pad keyboarding

Keyboarding Skills:

Sense Lang Typing

Dance Mat Typing

Kidport 4th Grade Math

Kidport 5th Grade Math

Navigation Skills: 

Make Belief Comix

Equation Editor Item Tutorial

Study Jams

ABCya Animate

Calculator Chaos - 5th Grade

Brain Pop

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Drag & Drop:

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Thinking Blocks

Common Core Links:

4th Grade Language Arts Skill Builders
4th Grade Math Skills Builders
5th Grade Language Arts Skill builders
5th Grade Math Skills Builders

Language Arts:

Turtle Diary English 4th
Turtle Diary English 5th
Grammar Blast
Grammar Practice
Vocabulary Practice
Reading Practice
4th Grade Language Arts Skill Builders
5th Grade Language Arts Skill builders

Math:

List of 4th Grade Math Skills and links
List of 5th Grade Math Skills and links
Turtle Diary Math - 4th
Turtle Diary Math 5th
4th Grade Interactive Math Skill Builders
5th Grade Interactive Math Skill Builders
4th Grade Fun Brain
5th Grade Fun Brain
http://www.eduplace.com/kids/hmcam/prep/prep_5.html
Graphing Tool

Social Studies:

California Native Americans Website
American National History Museum
California Missions
Gold Rush Game
National Parks
National Parks - Web Rangers
Map Snap
American Revolution Resources
http://kids.usa.gov/
50 States
National Geographic's for Kids
Colonial Williamsburg Site
Smithsonian Musium

Other Websites:

http://www.abcya.com/fifth_grade_computers.htm
4th Grade Fun Brain
5th Grade Fun Brain
*Read Think & Write