For years, my equipment for giving presentations was my trusty old iBook 12" (800 MHz, 640 MB of RAM), nicknamed "amalthea". I can't even remember how long I had it or how many presentations I gave with it. And then one day, a volcano erupted and in the ensuing chaos while travelling back from a conference, I managed to lose it.
So now I have to start looking for a replacement. But that's not as easy as it may seem, at least for me.