[masraum]

OK, if you are surfing, then your wifi connection can't be used/stolen. If you have a wifi router at your house, then it wouldn't be that hard for someone next door or in a car parked in front of your house to use your router's connection to get on the net. Still, it's really unlikely, and they would have to know some stuff, or at least do a little research to figure out how to do it if you have even basic security enabled.

Can someone steal your info or identity while you're surfing over wifi in a public place? Yes, but even that is fairly unlikely. Most wifi cards these days don't have the ability to go into promiscuous mode (a mode that can just listen to anything it can hear). That means that most wifi cards can only hear traffic destined for themselves. Are there cards/chipsets that will do promiscuous mode? Yes, and the folks that have them are the people that you'd have to worry about, but I bet they are .0001% of the population.

Could it happen to you? Yes. Is it very likely? No.