Atrios, and others, have publicly de-linked to Amazon because of Amazon's contributions to Rethuglican coffers. As much as I admire Dr. Black, I cannot claim to have such a strong reaction to Amazon's political affiliations. Amazon has taken thousands of dollars of my money, so there is probably some cognitive dissonance going on, however, I just don't think that contributing to Democratic thieves is in any meaningful sense intrinsically better than contributing to Rethuglican thieves. I'd rather my politicians remain un-purchased. Of course, I'd have to live on another planet for that to happen, but still.....
Apparently, I'm not alone in my ambivalence