Before watching a movie, I usually like knowing what I'm getting in to. Is there any way to watch the movie's preview from Netflix? I mainly want this for movies I can watch instantly.
You can use the Netflix Trailer Button Adder Chrome extension to add a "Watch Trailer" button below each film on the Netflix discovery page.
I typically use i.TV (or GetGlue) in order to see clips from TV shows, trailers, and videos of bands/musicians.
i.TV has an alerts feature to remind you that a new episode of a show you have 'favored' is available. It also provides links to the services that the show is currently available from. Services include: Netflix, iTunes, Hulu, live network television/cable, etc.