If you don’t have CRON access on your server, you may want to check out Psuedo-CRON. I think I’ll add this to the tasks documentation. Really handy for updating your iCal file or sending you e-mail reminders.
I wish I’d read one of these articles before doing my own experimentation. Luckily, I did manage to stumble upon the settings they recommend though.
I’ve been resisting posting a link to this, but I can’t hold off anymore… sorry.