I moved theonionfeed from its crappy old feed over to my
feed for it. Now on Tuesdays it will show links to all the new items and to the mainpage.
If this is a bit much (since it does produce fifteen or so headlines), you can instead subscribe to
of the Onion Horoscope feeds -- and when you see a new one of those
on Tuesday (or Wednesday, depending on timezones and whatnot), then you'll
know there's a new issue out.