Two services that help protect public Wi-Fi users
If you're using your computer away from your home network — whether in a coffee shop, at the airport or in a hotel room — chances are pretty good that your wireless network (even your wired network in a hotel room) is unsecure. Tools like Firesheep and Reaver can easily be used by hackers to find out personal information from Wi-Fi users on the same Wi-Fi network — you may think that the guy three tables over is just checking his email, but he could be stealing your credit-card information or passwords.
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Story added 20. August 2012, content source with full text you can find at link above.