Better avoid playing playing from a cyber café then (I know this not something really recommended but many people do this thinking their authenticator adds an additional security layer, I hope Blizzard communicates clearly about this situation).

I haven't been asked to enter any authenticator code since last Friday even when I logged to the battle.net website. As my IP address is supposed to be fixed, I'm curious to know how long I'll be exempted from having to use my authenticator ...

Lax, you're right my argument about the man-in-the-middle attack using a tunnel isn't really valid.