The movie-tracking app Flixster had an update recently which added support to stream full shows and trailers to your big screen at home via Chromecast. The update also included the ability to load up movies onto the SD memory card, so long as it's a Samsung device.
If you haven't tried it out yet, Flixster is a free app that that hosts a bunch of helpful movie reference information, such as cast, local showtimes, reviews, and trailers. Flixster is also home to a wide range of free and paid movies to watch on your Android device.
The library of Chromecast-friendly apps is growing pretty rapidly. Which ones are you using most often?