A couple of guys have figured out a way to hack the Nintendo Wii, opening the door for better home-brew software for the platform. The way they figured this stuff out is pretty cool, and it should be interesting to see what kind of new software is developed now that the "Keys to the Kingdom" are available.
My dad and I both agree that it seems to be in Nintendo's best interest to open up their hardware. Why they don't do it, however, is beyond what we can figure. Maybe they're scared of the game publishers having to compete against "open source" (i.e. free) games? It seems to me that having lots of great third-party, home-brewed software could only help your platform in the long run. Not to mention that it would open up the hardware to great uses as assistive devices (which would be great for kids with disabilities).