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Define "linux device driver". Doing what you ask could easily require including most of linux.

The exo-kernel guys tried to go a route that radically eases evolution. Normally an operating system tries to abstract and protect/multiplex.

They were writing a sort of microkernel, that only multiplexes/protects users from each other, but exported the raw hardware interface to userland. The abstracting part of the OS would be implemented as (possibly shared) shared libraries.

I'm actually (well, my friends are doing most of the work now) still writing one: http://www.xomb.org/

Interesting. I visited the wiki and will have a deeper look into it later.

Let me know if you have any questions, or feel free to jump on #xomb on freenode. We usually have a few people idling.

Isn't that what l4linux does? ( http://l4linux.org/ )