I have machines going all the way back to the Timex Sinclaire, but for the purposes of this survey, I'll only list the machines that my household actively uses.
Daughter:
iMac Ruby - G3@450
Wife:
TiBook - G4@550
Me ( hold on, this will take a moment )
iBook - G3@600 MHz
PM B&W 300 - G3@900 MHz
PM DA 73 - 2xG4@1.33GHz
Home Build - 2xPIII@1GHz
Home Build - Athlon64 3200
Coming soon Dual PIV 3GHz - home brew...
Max.