Book idea: Showing PC motherboards every 5 years since 1981 (maybe even earlier?), showing what changed and talking about the changes and what one can learn from them. Same with ISA/PCI cards and other things that went inside the case.
@mwichary that'd be very neat, yeah. I've thought about this sort of thing as a video idea, where I take an IBM 5150 and slowly upgrade it to a modern PC... going over each change as they happen