Thanks The Grunch!
That certainly helped to clarify the conventional configuration: The tailplanes have a downward lift to counter-act the CG being ahead of the Center of Lift:
http://en.wikipedia.org/wiki/Piaggio_P.180_Avanti
"The arrangement of the wing surfaces allows all three to provide lift, as opposed to a conventional configuration, where the horizontal stabilizer creates a downward force to counteract the nose-down moment generated by the center of gravity being forward of the center of lift."
The other aircraft you mentionned is still in trials or pre-production, so the Piaggo is most interesting...
Thanks to everyone who answered.
Gaston