Website Rec
If you've never been there before, check out www.freerice.com. You play a free vocabulary game, and for every word you get right, they donate twenty grains of rice to feed the starving. I won a thousand grains of rice before I realized it. The words are interesting, and they base your playing level on your skill--and you're helping people. I know that at least some of my flist likes to play with vocabulary words. :D
Go play!
Go play!