I checked in at FreeRice.com again today. I got all new words, and it seemed to remember my vocab level from last time. The words were a lot harder this time; I got 40 out of 42, but only because they give you 4 fairly different options for each word, making it easy to rule out at least 1 or 2 right off the bat. Some of the words I'd never even heard of before - delict and hyson are just 2 examples. I'll have to go back every so often and play again, if only to collect new words and stretch at least my recognition vocabulary. And the fact that I can help donate rice is a nice perq, too.
I think I've already mentioned the site where you can click to help fund mammograms. Turns out there's a related site that works similarly, but this time you click to fund food programs. This click-and-donate stuff seems almost too easy and painless to be for real, but snopes.com says they're legit.
And of course Locks of Love is another unusual charity in that it takes donations in the form of hair. I'm about due to make another donation, probably after the holidays when things slow down a bit.