Everytime I go to a Starbuck and connect to the WiFi I can see other computers in my finder. Some of them I can enter and see their documents. Can they do that to me too?... How can I be sure that I don't have anything sharing?
I see this all the time in Hotels and Airports too. iTunes finds shared playlists too. I read about someone finding share iPhoto libraries once too. You need to be careful about leaving these shared services on when you are not at home...