Books Articles
Power to the People: Free (as in Beer) O'Reilly Books and More
Most of the books here are just distributed online for free because they are older editions. They aren't using an Open license, except in the case of the many online tutorials that are linked here (which are typically carefully chosen, I found).
Getting Real: It's Not Just an 80's Catch Phrase
I mean, I love campfire and all, but you could've at least published with lulu
Book of the Month Club for Interface & Design Geeks
It's been a good book month for interface geeks and IXD/UX people.