gargouille; good chart!
wassup393;
The first Celerons were slower than 333Mhz - I used to have a 300A - which was one of the most stable processors of its time, and the overclocking king at a whopping 66% (it would run at 504Mhz stably).
Pentium Pros were a completely different processor to the older Pentiums, and had far more in common with Pentium IIs, with their true 32-bit architecture. They were the best processors for servers until the introduction of the Pentium II Xeons.
Cyrix were never competition for Pentiums, except in terms of price, and neither were AMD. Intel would not license the FPU, so Cyrix and AMD were stuck with the old, slow 80387.
It's debatable that the P!!! is the "longest-running", as many companies still use PPros in their servers. A Dual or Quad PPro server with 1Gb RAM makes a great Windows NT/2000 server, and an even better Linux server

Ordinary Pentiums, PIIs, P!!!s and P4s are not capable of SMP - apart from the new P4 3.06Gb with Hyperthreading, which does "virtual" SMP.
Not really true about early Celerons "failing abysmally" - they were popular because they were made by Intel and cheap. It's true about the crippled cache, though. This made Celerons undesirable at the "Bang for Buck" level, since they are noticeably slower than their Px equivalents, for not much less.
Durons were very popular among overclockers, because AMD decided to lock Athlons down. Duron 500s still are good, solid chips and a lot of people still own them. Duron 850s are legendary for their overclockability, and a second-hand one will cost almost as much as a newer, faster Athlon - because they are so good.
Athlon XP and P4 are the latest processors on the market, and there is little competition. Athlon XPs won't last as long as a minute without a heatsink - but, as you say, for the money, they are the best - for less than the price of a Celeron, you get the performance of a lower high-end P4. The required maintenance (heat control) is minimal, and part of the enjoyment of Athlon owning, IMO.
Athlon MP is the Multi-processing equivalent of the XP, similar to the Xeon/PPro in that respect.
AMD have come a long way in the last couple of years, and it is only relatively recently, with the introduction of the XP that I have become aware of them as serious competition to Intel.
CitrixEngineer@yahoo.co.uk