Steffen Walz has an interesting little project up, which he calls playce. It's essentially a portfolio site, but you can choose to navigate it by playing one of four small arcade style games. I think I enjoyed shooting down the paratroopers to navigate most :). When we talk about non-entertainment games, or serious games or whatever, usually we think about content innovation, but Steffen's effort here suggests that there are plenty of other, less explored opportunities for games as a part of everyday experiences.