I just stumbled over this:
http://readwell.penguinrandomhouse.com/
If you read samples of books, Penguin will donate books to Save the children.
I've read a few of the shorter samples and found one book I'll probably buy -- which of course is what Penguin wants, but hey, if I can discover tempting books and help a good cause at the same time, I'm not objecting
Note: It only lasts until the 23rd, so don't wait too long if you want to do a good deed by reading.