This is how to do it:

* Create an account at http://pogdesign.co.uk/cat/
* Select your favorite shows ("Add shows to your filter")
* Get the ical file address and import it to google calendar
* Name the calendar "TV Shows"
* Enable E-Mail notifications for this calendar
* In your E-Mail application (i used GMail), set up a filter with two rules:
- From: calendar-notification@google.com
- and "Subject contains TV Shows"
* Let the filter forward the emails to your RTM Inbox address

From now on, new episodes will show up in your Inbox like this:
"Fwd: [Reminder] Saving Grace 3x2 - What Would You Do? @ Wed Jun 24 06:00 – 07:00 (TV Shows)"

And if you missed them on TV you can acquire them and then watch them and then complete the RTM item :)

Caution: The air times may be incorrect because of timezone conversions.

have fun,
chris