Sprite – Spark Movie Director2010
AS3 development, team of 4 devs
XML Driven except for dynamic content using FB API
Facebook users can select characters, settings and plots to create their own animated short films (which in actuality meant selecting one of a few hundred pre-rendered permutations, alas). Users can manage & share films, create playlists, watch the films of others, view behind the project scenes. The sister app was a mixer that allowed users to create their own music from a selection of samples.
Something I recall as rather neat about this one was having to come up with smart textfields that would stretch/grow/re-center/truncate/append to handle user-input of unknown length in various languages.