It's not just about vocabulary lists! A better vocabulary will enable you to communicate better, which in turn will enable you to be more productive. With a better vocabulary, you'll more readily enjoy great books and understand today's news. (from VocabularyCoach)
There are myriad Internet sites devoted to vocabulary and vocabulary acquisition. Though VocabularyCoach is one of those many, its straightforward look and games make it worth exploring. To do so, click the above hyperlinked text.