Ninja: keep an eye out for
Facade, when it gets released for free later this year. This is a fantastic example of dynamic non-linearity that's also
focused. There's a couple articles on Ludonauts that should give you a decent idea of what's going on there (my GDC impressions and William's Guiltier Pleasures). Facade was an IGF finalist and also procured much interest from major game designers at the show (I was there when a person from Ion Storm expressed an interest in using the technology, but Warren Spector himself also keeps in touch with Facade's creators, afaik). It's very much where the future of videogames is headed, imo.
