The following is a graph of the number of times my MyReminders Android app has been downloaded since I put it on the market:
That spike in the graph? The direct result of my app being reviewed on the Android Central website. It certainly demonstrates the impact a little media exposure can have when your app is merely one upon thousands on the market.
It's also a lesson in customer relations. The guy who wrote the review was one of the first users of my app: he began using it a month or two prior to becoming a writer for Android Central. He and I had exchanged a few e-mails regarding the app (ideas for improvements, mainly), and I have to wonder if he would have done the review if I hadn't been responsive to questions from him and other users.