Intel/AMD Processor Guide
At last night's meeting, there was a brief discussion of processor families and roadmaps - spurred by Apple's switch to Intel CPUs. I found two reference tables that can be used to see what the various Intel and AMD x86 processors offer as far as features, process size, clock speed, and so on.
The first and most exhaustive of these is at Tech Report - it hits virtually every Intel and AMD processor over the last several years. The second is at The Inquirer, and simply is a reference to the current Intel processor line.
Both provide useful data you can draw from in evaluating platforms.