Here are feeds (RSS) and calendars (iCalendar) for TV shows. Source is
Wikipedia.
Problems:
sometimes when information on wiki page gets updated (like title
of the episode), feed reader will probably show you the episode again
(Google Reader does this).
Missing your favourite show?
Find "List of [placeholder] episodes" page on Wikipedia.
Find out which columns are for episode number (preferably the one
with SxxEyy format), title and airing date (derive from latest season
as this format is interesting).
Mail it along with link to the wiki page to serialy at disorder.sk.