your vidalia isn't supposed to complain to you if some other relay has the wrong time. only if the directory authorities have the wrong time.
control_event_general_status(trusted ? LOG_WARN : LOG_NOTICE,
"CLOCK_SKEW SKEW=%ld SOURCE=DIRSERV:%s:%d",
delta, conn->_base.address, conn->_base.port);
looks like we send the controller status event, and hope vidalia doesn't freak the user out if it's just a 'notice' event
perhaps vidalia should be handling it differently