While the Zonbu isn’t technically an embedded system, the fact that the software stack is meant to be “locked down” puts it in the same camp.
Ari Jaaksi, who is intimately involved the the Nokia N800 Internet Tablet (which is Debian Linux based) recently spoke at LinuxWorld in San Francisco. LinuxDevices.com is carrying a good summary of his talk.
Jaaksi makes some interesting points, many of them relevant to the Zonbu’s development cycle. For example:
Another challenge is to interest community developers in the final fit, finish, testing, and integration phase of software development. “Once the basic application service is working, a developer is happy with it. It’s only about 50 percent done, though. You still have to do internationalization, make sure it doesn’t use too much power, and other things.”