Steven Gould (author of Jumper and current President of the Science Fiction & Fantasy Writers of America) just posted a link to handful of great science fiction that you can purchase to support a couple of worthy charities.
From Gould's Google+ post:
Homeland (audio) by Cory Doctorow, narrated by Wil Wheaton (an exclusive)
Uglies by Scott Westerfeld / Simon & Schuster
Tithe: A Modern Faerie Tale by Holly Black / Simon & Schuster
Jumper by Steven Gould / digitalNoir
The Happiest Days of our Lives by Wil Wheaton / Monolith Press
Mogworld by Yahtzee Croshaw / Dark Horse
Zombies Versus Unicorns by various / Simon & Schuster
Benefitting the WorldReader Campaign and the SFWA Emergency Medical Fund
This is a great chance to get your hands on some outstanding books and help some people at the same time.