Of course, Android runs on a Linux kernel, Nokia N900/N950/N9 (basically) uses Maemo, which may be considered a Debian derivative. MeeGo is already up and running on several devices. And more standard Linux versions on smartphones isn't that far-fetched anymore.

HTC Desire HD was recently hacked to run Ubuntu natively:

Why then, not introduce our really tried and true distro to the phone: Knoppix? (I have a HTC Desire Z - slide phone where I would really like to run Knoppix. I realize that getting the standard phone functions up and running may be a tall order, though.)

But - a Wayland-based Knoppix on phones - think it might be a good idea!
Probably, most of the MeeGo work will be usable here - the beauty of open source again.