Oh, I hate that:
I will be out of the office starting 09/01/2003 and will not return until
I will respond to your message when I return.
The thing is, those autoresponders seem to take anything between one minute and one week to respond so I have no idea to which of my mails the above is referring to. Clearly it must be from some mailing-list (where I always cc my mail to the OP).
People using such autoresponders when being subscribed to mailing-lists should be unsubscribed (or preferably: shot or sent to the moon).