New Hacking Tools Pose Bigger Threats to Wi-Fi Users – NYTimes.com.
If you use unsecured wireless networks or even secured wi-fi that is shared with others, like in your local coffe shop, you will want to have a look at this article by Kate Murphy in the New York Times.
Using a simple and free piece of software called Firesheep, that person sitting next to you can see what you are doing online, then login to sites you’ve visited using your login and password.