SideJacking: Stealing information when you connect to someone else's WiFi

Users may think that their personal data is safe when they use a secure login page online, but that's quite far from the truth. In fact, everything from the contents of your e-mail, who your friends and acquaintances are, and almost anything else you can think of could be easily exposed by hackers if browsed via WiFi network, security firm Errata Security pointed out in a recent paper presented at this year's Black Hat 2007 and seen by Ars Technica.

Link:
http://...-report-sidejacking-session-information-over-wifi-easy-as-pie