These days, I usually rediscover the definition of words with an online dictionary. Although the straight definition helps, finding the antonyms and synonyms helps as well. Browsing around I came across lexipedia. This site is wonderful as it takes the antonyms and synonyms, as well as fuzzynyms and draws a map. The map itself is flash based and is very responsive. Of course, watching the words fly around with a single click helps boost interest. It's been very helpful discovering words again in depth using this Website.