> Powerbooks did seems to surge in popularity...

Exactly, and they, alone or at least together with iBooks, have surpassed the Mac mini, I think.

> But even you, when it was time to upgrade, switched up to a G5.

Even the fastest PowerBook wouldn't have been that much of a performance upgrade over the 1.5 GHz Mac mini. And for my mobile needs, a laptop/notebook is still too bulky. I have a tablet computer for this, unfortunately not with MorphOS, of course. Fun fact is that the PowerMac G5 is even older than the Mac mini, and its reliability shows (severe soft boot problems).