You can stream full-length movies on wifi or 3G, or download them to watch offline. To access your movie library, install the Flixster app (free in the App Store), then go to the My Movies tab and log into your Flixster account. Your collection will appear on that tab.
To stream a movie, tap on the poster image for the one you'd like to play, then on the "Watch Now" button on its details page.
To download to your iPhone, iPod Touch, or iPad, tap on the movie you want to download, then on the purple Download button on the next page. Once the download is complete, you'll watch it from the Flixster app. Tap on Watch Now, and the app will default to offline viewing.