Jake of the Web

http://www.freerice.com/
Recommended by Asa Reynolds
This site, through funding provided by advertisers (small ads at the bottom
of the page) donate rice to the UN World Food Program. The place where we
get involved is we go to the site and answer questions to help strengthen
our vocabulary. Each correct answer buys 10 grains of rice. This has the
two-fold intention to educate us and feed the hungry.

This site began on October 10th of this year, and it is very cool to see the
total grains of rice and how the daily totals are growing
exponentially:
830 Grains on October 7th
42,153,550 Grains on the 28th