Webster's Dictionary on-line (spelling counts!) http://www.dictionary.com
Everything about GRAMMAR on one site! Great if you have a question or you want to hear a different way of explaining some pesky rule. http://owl.english.purdue.edu/handouts/grammar/index.html
This is a great site to get background information on many things: authors, time periods, books, events and the like. It could be VERY useful for class discussion! http://www.about.com
We will be reading some Shakespeare this year in class. When we get to it you might find this site helpful. http://www.shakespearehelp.com