I’m very much into improving oneself, if you didn’t already know that. I just discovered Word Dynamo, which is a challenge based on dictionary.com and designed to improve your vocabulary skills! There’s a number of challenges you can take, ranging from Shakespeare terms to historical figures and Latin vocabulary – and it’s all meant to improve yourself. As you take each challenge, the site gives you an updated estimate of how many words you know, and how you compare with others at your age/grade level. Check it out here!
(For the record, I just took the basic placement challenge for ‘college and above,’ and Word Dynamo told me that I know approximately 42,052 words.)