This online dictionary will help you with spelling and vocabulary development. http://www.yourdictionary.com.
Funbrain offers a variety of games for grammar and spelling practice. http://www.funbrain.com.
Book Adventure will guide you in your book selection. http://www.bookadventure.org.
The following web sites will help you find nonfiction articles to bring to class. http://www.timeforkids.com/tfk
http://www.socialstudiesforkids.com
http://nytimes.com/learning/students