I just thought of this while replying in an earlier thread. I know including an english to english dictionary at some point has been discussed, but for learning Chinese including an english thesaurus would actually be more useful. Reason being that often times when I look up a word in an E-C dictionary I'm unable to find what I need, or it's not quite the right sense. At that point I'll start looking up synonyms to see how they're translated. Having a thesaurus in Pleco would be handy under that sort of scenario.