There is an ad-on for Mozilla Firefox called FireSheep, which allow others to snoop on other people’s account in a public network. Users in networks such as hotels, airports and Starbucks are vulnerable when accessing their email, social networks and online banking.
This is all the more reason to be wary when accessing public networks. Online banking is definitely a no-no. Perhaps now, accessing your email or any of the social networks is also off the table.
If you must use a public network, use VPN to protect yourself from Firesheep. You can use your office VPN if you happen to have one. The other option is to use your home router, if you happen to have a router that supports VPN.