ooooh a CPU history list...here's mine:
Intel Pentium 1 (166MHz speed) 1997 (first ever Family PC)
Intel Pentium II (couldnt remember the speed but this was used for the first ever machine I built back in 1999. Remember the Slot format? yes that rather elongated one lol)
AMD K5 400MHz (this was going to be used in the family PC til I realised it wouldnt work lol so I used it on another machine I built which unfortunately was stolen and that was a shame cos that was when I started to do overclocking back in 2000. If I remember right, the highest I had it OC'd to was 920MHz lol)
AMD Duron (got this one in 2001 with a system I put together. After 18mths it also got stolen, probably a good thing cos I was running Windows ME on it lol)
AMD Athlon XP 2500+ (2004 this was purchased and it was at the time the best AMD CPU to posses. It was using the Barton core and it allowed me to overclock it to 2.2GHz from 1.8GHz with ease. 5yrs later, its now being used as my FTP server)
AMD Athlon X2 4400 2.2GHz (2006 I got this when I moved to dual core. Still being used today in a test machine which has Windows 7 Ultimate running. Till the HDD died on me so I am waiting to get new one lol)
AMD Athlon X2 6000+ 3.0GHz (purchased 2007 for my first ever gaming machine, then moved to main machine status but I might use it as either another testing machine or just build it and sell it to someone)
Intel Q6600 2.40GHz OC'd to 3.6GHz (2008. Without a doubt definitely the best ever CPU I have purchased. Used for the new gaming machine. Parts will now be used as the new main machine)
Intel Core i7 920 Now in use for gaming and benchmarking
So there you have it