Language Skills

These are good language building sites:

VMI Spanish Drills 
Free on-line Spanish tutorial (StudySpanish.com)
Try a Spanish placement test!
verb conjugator

http://www.webworkbooks.com/spanish/spanishworkbook/index.php 
Talking Dictionary: http://www.webworkbooks.com/spanish/dictionary/
 

BBC's El Mensual

Weekly Quizzes:  http://www.webworkbooks.com/spanish/quizzes/spanish-vocabulary-weekly-quiz-07-10-01.php
Verb Reference: http://www.webworkbooks.com/spanish/verbs/

ChezPhil's page 
Free grammar exerises
Barbara Kuczon Nelson drills
Matthew D. Stroud's exercises

online dictionary
Webspanol
Wordreference.com
Great site for kids