You have time to kill? Well go and play Free Rice - for each word you get right, they donate 20 grains of rice to the UN World Food Program. Thanks to the competitive element - my best vocab level so far is 43 - it's better than any Word-of-the-Day and you actually learn something while killing time and doing good. For example - did you know that tatterdemalion is another word for ragamuffin because I didn't even know it was a word! How's that for value-add?