After some failures in the upgrade process, I've finally got my laptop successfully running ubuntu feisty and scratchbox 1.0.7 with maemo rootstraps installed yesterday. At night I decided to do a real test in the environment building the latest version of Leafpad for the N800 device. It took me more time than I was expecting but in the end everything went just fine.
I've just uploaded the packages to the Maemo extras repository, both to N800 and 770. This way you can install it with a single click:
I was very pleased to see it's being somehow useful when Jean-Luc told me it is the default editor used by claws-mail.