Introversion caught the attention of the mainstream media a few years ago with a high profile essay in the Atlantic Monthly by Jonathan Rauch called Caring For Your Introvert. Rauch's essay, in which he claimed to be an introvert, received a huge response from readers. In fact, this article is the most popular article of the magazine's on-line version.
Rauch was interviewed by fellow writer Sage Stossel in early 2006 in the article Introverts of the World, Unite! to talk about the impact of his article. The response to Rauch's article was so powerful that the Atlantic Monthly shared reader responses in a 2006 follow-up article called The Introversy Continues.
If you are wondering if you might be an introvert, I'd recommend that you read Caring For Your Introvert. It's a good overview on the topic.