We have an amazing man here where I reside who created a fun website where you can play a game which helps to increase your vocabulary and while you are playing you are actually donating food to people in parts of the world where it is needed most.
The site is called Free Rice. As of February 10, 2008 18,174,763,250 grains of rice have been donated by people who have played the game. It is really stimulating and anyone can play. Challenge the kids to see who in the family can get the best score, and donate the most rice. You can even watch a video of the rice being distributed.
So go on over to Free Rice and start donating rice while you build your vocabulary.