I just found this great site to build vocabulary. It's called Learn Vocabulary Fun.  There are six games with real educational value (no shooters here): HangMouse (formerly Hangman), Crossword Puzzle, Word Search, Vocabulary Quiz, Picture Match Game, and Word Scramble.

Plus, there are some great articles on building vocabulary for specific purposes.

Expand Vocabulary - Good vocabulary comes in handy. It makes you a powerful speaker and writer and builds your confidence. Find out how you can quickly expand your vocabulary.

GRE Vocabulary - This article looks at how you can boost your GRE vocabulary using software. It covers the benefits of using this software such as maximizing your learning time.

Improve Vocabulary - Explains five sure ways you can improve your vocabulary.

Increase Vocabulary - How does the vocabulary you use reflect your personality?

Power of Words - Powerful words are words that create a dominant image or impression in our minds. Find out how using power words can help you.

Vocabulary Builder - This article examines the intricacies of a language through the study of etymology. Find out how this can build your vocabulary.

Vocabulary Software - Which vocabulary building software is right for you? This article helps you choose carefully and tells you what to look for.

Ultimate Vocabulary Review - A review of the popular Ultimate Vocabulary Software

Word Smart Review - A review of Word Smart

Building a Million Dollar Vocabulary - This article show you how vocabulary is closely related to financial success and how you can start building your vocabulary for success immediately.

Vocabulary CD Programs - Looking for a vocabulary CD program? Read this first to find out what you should look for.

Building Your Business Vocabulary - This article discusses the importance of vocabulary in business success and shows you how to start building your vocabulary for business success.

Why Improve My Vocabulary? - This article discusses the advantages of improving your vocabulary. Are you wondering if you should bother with your vocabulary? If you are then this article is for you.

Improve Your Vocabulary Fast - Is time a factor for you? This article explains how you can speed the process of building your vocabulary.