its been entertaining initiating screen sharing with apple stores since leopard arrived. from anywhere too. often customers accept the requests without knowing what they are getting into. but, when they walk away, the next unsuspecting user does not know they are being watched. its easy enough for me to remove the ichat icon from the menu bar when no one is looking. people read their email, browse myspace, etc . . . it might be a good idea for apple to add a warning every 10 minutes or so reminding that your screen is still being shared, and if you wish to continue. you and i would make sure to end it. other users may forget. and here is a youtube gallery of my experiments