You've probably seen this already, but if you haven't, go read Richard Russo's "Amazon's Jungle Logic" at the NYTimes: http://www.nytimes.com/2011/12/13/opinion/amazons-jungle-logic.html?_r=1&hp.
In a new low in shopping promotions, Amazon is giving shoppers a discount if they go into a brick-and-mortar store, compare prices on an item using some price-compare app, and then buy the thing on Amazon.
On a world-affairs scale, that may not amount to much evil, but on an everyday-consumer-life scale, that's evil. It's even ratcheting up a notch the ethically dubious practice endorsed by staid old and usually not corrupt Consumer Reports of test-driving a car or checking out consumer electronics at your local dealer and then ordering it online to save money.
Here's a tip: those brick-and-mortar stores don't exist as free showrooms for online businesses, although Amazon.com would like to think they do. If we keep using them that way, pretty soon those free showrooms won't exist, especially in the book world. You won't stumble on books or find a gift by looking around a store filled with books, because there won't be one near you.
I still do buy from Amazon.com, especially when it's some book of lit crit that no indy bookseller would have or when sending a gift that would mean an hour in line at the post office. But I turned the tables on Amazon by printing out the "wish lists" of gift recipients. I plan to head down to the friendly independent bookseller with those lists later this week--and I won't be doing so with any Amazon Judas app in tow.