well besides having an atari when I was younger here is my CPU history:
Pentium 75mhz (still have, not in use)
Pentium 200mhz MMX (still have, not in use)
Celeron 300a @ 450mhz (sold it)
Celeron 466mhz (still have, "parents" PC)
K6-2 350mhz (still have, in my laptop)
Pentium Pro 200 with 256k cache (sold, was going to use in linux box but never did)
Celeron 633 @ 950mhz (still have, in my backup system)
Athlon "Classic" 800mhz (still have, in my main system)