From the blog "We Are Respectable Negroes," in a post by Chauncey DeVega declaring May 26 a "Be White for a Day" Holiday:
"The ultimate power of white privilege is the ability to determine when and how one will be uncomfortable."
And a useful distinction from a comment to the same post:
"... notice the difference between white and 'White.' It is a huge one... This isn't about white people it is about Whiteness. "