I want my TV listings via RSS or Atom. Atom would be great because it allows arbitrary XML to be inserted, so you could add RDF triples to add machine readable versions of most of the information.
It would in particular be interesting to allow easy publication of customised schedules for fan sites etc.
Maybe I'll have to hack something together based on XML-TV
Now that I think of it, this would work great for things like playlists as well...