www.conjuguemos.com -Great for extra practice with vocabulary and grammar concepts. 

www.wordreference.com - This site is an online dictionary, thesaurus, and verb conjugator. The dictionary provides discussion forums for people who have questions or comments. Excellent for providing diverse definitions from different Spanish-speaking countries.

www.spanish4all.com - An excellent resource, this site provides numerous links to dictionaries, grammar exercises, Spanish magazines, Spanish Online news, etc.

http://www.classzone.com/books/en_espanol_1/?state=MI - For Spanish 1.  This website goes along with the  En Español I textbook.

http://www.classzone.com/books/en_espanol_2/?state=MI - For Spanish 2.  This website goes along with the En Español II textbook.