Over Thanksgiving weekend, I discovered a cool new site, via my aunt by way of my mother. It's called FreeRice.
The site gives you a vocabulary quiz that is quite hard -- my best level was a 46 -- and featured words like "scintilla," "veld," and "decollate". Word difficulty increases with every question you get right. For each correct answer, the site donates 10 grains of rice to a starving country via the UN -- site advertisers foot that bill.
FreeRice's sister site, Poverty.com keeps a grim death toll of people dying from hunger each minute.
Do something that's good for your vocabulary and for the starving -- check it out.