Thanks Tobi for your answer.
Thanks for your correction, I missed squeezy and squeeze. English isn't my natural language.
Really, itask documentation / how-tos are quite rare. I'm using e17 repo for squeeze:
deb http://packages.enlightenment.org/debian squeeze main extras
What I'd really like to do is set itask using the binaries packages from this repo:
~$ aptitude search itask
i emodule-itask - ITask Application module for Enlightenment
i emodule-itask-ng - Itask NG module for Enlightenment
Still I didn't find any clue.