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Platform: Windows Phone 8
Price: Free, $1.49 for full version
Instagram is not one of my personal do or die apps, but for many people it is very important and is an app that limits their use of Windows Phone. While we don't yet have an official app, Itsdagram does a fine job and supports the Metro UI.
(Image: Man of Steel)
Man of Steel
Another movie-related app can be found on Nokia Lumia devices. Man of Steel is an app promoting the upcoming Superman movie. By playing various small games and challenges you unlock access to wallpapers, ringtones, DC Comics digital comic books, and more.