A New York Times article offers useful reminders that "Web Surfing in Public Places Is a Way to Court Trouble."
When on your own laptop, make sure to maximize your security strength:
- Set your ZoneAlarm firewall to HIGH.
- Add the new wireless network to the "Untrusted" zone.
- In advance, add sensitive data to ZoneAlarm’s IDLock (available in ZoneAlarm Internet Security Suite and Pro).
You’ll then be warned if your data is being transmitted from your computer at a time when you haven’t sent it.
A note about the alerts: If you have short numbers like 1234 you may get warnings since IDLock reports on any data leaving the computer including network traffic.

This is useful information. I’ll be more careful next time.