I enjoyed playing with the quizzes on freerice.com.....learnt a lot of new words, found I wasn't as good in grammer as I thought I was, got a bit more clued up about art and the capitals of the world. Discovered some countries I didn't even know existed, and learnt some spanish words, which will be handy for the grand goal of 2012 aka the Inca Trail.
And the best thing? For each right answer, sponsors (ie advertisers) donate 10 grains of rice to a worthy cause. Right now, it's the drought stricken region in the horn of africa.