Well, if it hasn't reached you yet, it will soon -- hundreds of books on GLBT, teen sexuality, and women's issues vanished from Amazon.com's sales ranking lists over the course of Easter Sunday. The blogosphere has, quite predictably and understandably, shit a brick over this, especially as the problem seems to have been outstanding since February.
Now I do not personally think this was a corporate decision, but Amazon customer reps have been sending out form letters calling it a "glitch" (after an initial round of form letters that would seem to indicate that they had no idea what was going on). They have yet to post anything on the front page, though at least a few people (including me) believe that the system was intentionally trolled during a time when most of Amazon's US staff was probably home for the Easter weekend, and at least one person is claiming responsibility (though his credibility is in grave doubt, based largely on his lack of programming mojo). (There is an ongoing Twitter discussion at #amazonfail.)
Amazon knows this has been a disaster for them; many people have canceled orders, and I myself sent a note saying that I would not only postpone any purchases I'm considering (I had a couple in mind, including the new Michael Ruhlman book and a deck of Spanish playing cards) but that as a Vine reviewer, I won't be submitting any content until it's resolved. I'm willing to grant them a presumption of innocence, but even if they are innocent, they're handling it poorly and deserve to lose massive amounts of money over it.