^ It's probably jealousy more than anything else. Apple pretty much single-handedly revolutionized (some might say invented) the online music industry, with the iPod and the iTunes Store. And now they're poised to do the same with eBooks, now that the iPad (a potential Kindle killer) is on the loose. Some people just can't abide that.
They will most likely whine about how Apple is controlling the book and music industries now. My response is: I'll send a telegram when I give a crap. Apple satisfies my needs quite handily. I don't CARE what they control. (Besides, I trust Apple far more than, say, Microsoft...)