White Privilege: Unpacking the Invisible Backpack by Peggy McIntosh - a primer
When Exceptions Prove the Rule by Tim Wise - for those who think they don't benefit from whiteness just because they grew up poor or in the hood
Derailing for Dummies - how to converse with marginalized people!
Cultural Appropriation Bingo - a fun game for the whole family! Because you are entitled to have your way!
White Liberal Bingo - a wonderfully passive way to marginalize the experiences of your other best friend(s) who also just happen to be black/Mexican/Asian/etc.
The Crommunist Manifesto: The People You Meet When You Talk About Race
101 Primer - an even more exhaustive compendium (with a few links repeated)