Public computers at cafes, libraries or car dealers offer a convenient way to access internet when you are away from home or office. But be careful. It's impossible for an ordinary user to tell if the computer is secure or not. Since anyone can use the computers for anything, they have probably been exposed to viruses, worms, Trojans, keyloggers, and other nasty malware. Should you use them at all? They're okay for casual web browsing, but they pose a risk for connecting to your email, bank, and the server at your office or for shopping online.
If you do need to use a public computer, make sure you use "Private Browsing" in Firefox (Tools-->Start Private Browsing) or InPrivate Browsing in IE 8 (Saftey-->InPrivate Browsing), which helps prevent anyone else who might be using the public computer from seeing where you visited and what you looked at on the web. Also if you login to any important online account, don't forget to change the password afterward (on your home computer).
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