Traveling this spring break? Airport terminals, shopping malls and even your local coffee shop often have unsecured wireless networks that don't require log-in credentials. Using them is a risk. They put you on a network with many other people, and some users on the network may be looking to intercept any personal information you enter.
Lightly browsing the web, and having proper firewall and security software running on your computer, makes the risk not as great, but you should never enter any of these things on a site while using an unsecured wireless network: