Capt CB's idea of a tail-ground proximity warning to warn for overrotation on T/O or landing is intriguing. I'd imagine such devices would be relatively inexpensive and simple to install...after all, even minivans are coming equipped with sonar to prevent bumping into obstacles while backing up.
An extremely simple computer could issue an aural advisory based on tail clearance and closure rate. Properly calibrated, these aural indications could provide the pilots with an accurate mental picture of tail clearance during rotation and flare.
Certainly, a proficient pilot should already have a rather accurate idea of tail clearance based on other cues. It seems to me, however, that this idea could be beneficial to pilots who are less experienced or task-saturated.
-WN