I was thinking of subscribing to www.dictionary.com but am not sure if it is worth it.  I am able to do a lot of lookups now for words.  What I am not sure is if you get more words or something like that if you subscribe.  They do mention you get some word games but I am not interested in that.  However, I would be interested if they offered some kind of vocabulary building software.

Has anyone here subscribed to this site and if you did was it worth it?

I am pretty happy with http://www.thefreedictionary.com/.  As far as vocabulary building, there are several free lists for that too, including Merriam Webster's Word of the Day: http://www.m-w.com/  (actually opening up a decent print dicitionay accomplihes the same thing).