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Public wireless is always wide open and anyone with even slightly decent skills and tools can sniff ALL traffic on the wireless network.
If you are connecting via https, then that traffic is encrypted and safe. Yes...if it were weak encryption it's possible that someone could decrypt it, but with all the low hanging unencrypted fruit, they wouldn't bother.
Either way, always use a VPN or SSL when on a public wireless network. Of course, the safest thing to do is to just not do anything that you wouldn't want a stranger to see.
-- Bill
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