Reference links...
Jonathan Bowen's (Oxford University Computing Laboratory) instruction summary cards.
Intel's Online Musuem
Intel CPU die pics (PDF file)
Intel's CPU quick reference guide for 486 and earlier.
Their newer processors are listed also.
Intel paper on the Pentium FDIV flaw
Intel CPU roadmap charts 1998 onward
at MumbleGrumble by Christian Korner of Plasma-Online fame.
Using Intel Japan charts.
Other CPU manufacturer roadmaps
also at MumbleGrumble