The cautious (or is it paranoid? Nah, definitely correctly cautious in this case) crew over at the TechZone have slapped up a couple pages about how to CYA while using a public WiFi hotspot. You never know who's lurking around those just waiting for someone to give them the key to the kingdom, as it were...

"Well, that's the point of Wi-Fi hotspots; being able to take care of a few things while in a relaxing atmosphere. Don't, however, get so relaxed that you ignore security and give all your confidential information to some unscrupulous hacker."