Trailers vs. Previews

I love movie trailers, I could watch them all day at the theatre, at the QuickTime site or on AppleTV. And I like TV previews for shows coming next season.

But I can't stand TV previews for the next week. I'll generally leave the room if other people are watching or skip over them. Occasionally I'll catch them (and occasional they'll excite me) but usually I'll pass. I think it's that they give away too much of the plot of the show and depending on the show, I don't feel like I need to watch it (I guess). I just watched the show, if that's not enough to get me to come back next week the preview probably won't.

Speaking of trailers, have you seen: