Is Google Making Us Stupid? appeared in The Atlantic Magazine July of 2008. It has a lot of interesting ideas, particularly near the end. It is very apparent that we are moving towards redefining what it means to think (and what/who does the thinking). Whether that is good or bad is secondary to whether or not we have control over it.
The title and various snippets are sensationalistic, but the central theme is a good one. The author, Nicholas Carr, expanded upon the article in a book published earlier this year, The Shallows: What the Internet Is Doing to Our Brains.