This makes me a little weepy because I both used the Graphic calculoator app on my macs, and idolized the very first PPC mac I used (a Power Mac 6100/60) back when I could recite the hardware specs of every Mac made since the Mac Classic.
However, I am pleased to link to this entertaining story about teh birth of Graphic Calculator, a fantastically useful little program that came with Power Macs.