Siliconera. The Western-themed top-down shooter, titled Project Dropship, was not formally announced before its quiet cancellation, but based on the footage it looks like it was fairly far along in development. It also looks and sounds like it had a Firefly thing going for it, which is really, really working for us.
Or, rather, it would have worked for us. Now it just makes us sad that nobody's made a Firefly game yet. What gives, entire video game industry?