@ragnar:

Yes, UI-wise, S60 is pretty much what I want already. As I said, I'll keep using it.

I'd just prefer to have a GNU/Linux-like OS underneath the pretty icons. With Symbian, I'm a dumb user who has to trust a GUI. With Maemo, I could really own my device.

Anyway, I don't expect this to happen as long as the current touchscreen-craze lasts. I was more interested in the technical aspects of would it be possible and how much effort would it be.