Activities for anytime:
http://www.manythings.org/vocabulary/ many activities
http://multiplication.com/interactive_games.htm multiplication games
http://www.coolmath4kids.com/times-tables/index.html math games
http://www.kidport.com/ all subjects
http://resources.kaboose.com/games/read2.html language arts games
http://www.mathcats.com/explore/mathcatsgames.html math games
http://www.ezschool.com/Games/Multiplication2.html multiplication game
http://www.ezschool.com/Grade3Games.html
http://www.kidsknowit.com/educational-songs/index.php songs for teaching most subjects