Fun with Spanish includes several sites that include vocabulary
games, practice exercises and information sites.
http://www.kn.att.com/wired/fil/pages/listspanishdi.html
Hundreds of practice exercises for vocabulary are found here.
Most designed by Spanish teachers. Just search for a topic and
there will be concentration, matching, and other types of games.
http://www.quia.com
Use this website to familiarize yourself with, learn, and test
yourself over any group of vocabulary words that you enter. It
will make online flashcards for you to use on the computer screen
or print out. You can use this site for any subject area.
http://www.quizlet.com
Use this site to practice Spanish grammar skills. It is
especially useful for repetitious practice with verb forms in
most any verb tense. It includes explanation of grammar
structures and other helpful information.
http://www.studyspanish.com
The conjugation trainer allows people to choose the tense they
want to practice and 10 verbs (from a selection of regular and
irregular verbs) to practice with, as well as what subject
pronouns. The online program gives feedback about the correctness
of a typed form and keeps track of overall results.
http://www.spaleon.com/index.php