free rice
I know some of you won't care, but I also know some of you are geeks like me. Go out to www.freerice.com and check it out.
The gist is it gives you a word, and four choices as to what it means. For every word you get correct, their sponsors (the banners at the bottom of the page) donate 20 grains of rice to third world countries.
It's simple. No sign up. No username/passwords/anything. Just click away.
I think of myself as a pretty smart person or at least to have a fairly large vocabulary, and when it gets up to level 40ish, it gets really hard.
So get at it geeks. Save the world. :)