Seussville-A look into the world of Dr. Seuss. There is a whole section for games and activities. http://www.seussville.com/seussville/main.html
FunBrain-An activity site that covers all content areas. Be sure to check out math baseball! http://www.funbrain.com
Starfall-Reading website http://www.starfall.com
AAA Math Lessons has an extensive collection of lessons covering almost every aspect of mathematics and at all levels. Be sure to choose 2nd grade! http://www.aaamath.com/