Landscape-only printing

I seem to have the opposite problem of the many Leopard-users who can't get their printers to print landscape. My new iMac will print ONLY landscape format out of Safari and Mail, unless I go into the preferences of each program and click the portrait button. This happens no matter which brand of printer we send the job to, so it has nothing to do with our Canon, Konica or HP drivers.
Is there any way to make "portrait" the default setting for all print jobs? It's not a huge hassle to reset the prefs every time I want to print something from Safari or Mail, but I'd rather not have to bother.