I recommend just picking a topic (Ghosting, for example) and learning about it, then moving on to another one.
For example: Ghosting. Here's a good writeup I found once (with pictures!)
http://www.dribin.org/dave/keyboard/one_html/Specifically what ore you interested in? Comparing this to Audio: Some people are big into how things sound, where as others are big into empirical data. Reading reviews and testimonials will give you a wealth of information as to how things "feel" and what They're like, whereas reading force curves and design specifications will give you more "data" to work with. I fond both to be useful.
I really am interested it looking into the keyboard innards and the design choices the company made. When you start getting into higher reliability, it becomes more than just an issue of keyswitches and build quality: They even look into different ways of plate-mounting, and ways of connecting the plate to the case. Imagining what the engineers were thinking allows me to start to understand what sort of guidelines they follow, and what aspects of the design are most important. Then, I match these up to my personal preferences and make a decision about the keyboard.
One example: If you look at the DIY mounting plates for the Phantom and DOX keyboards, you'll notice they are flat. The mounting plates for most commercial keyboards have the very edges bent down to match the PCB. This lends the plate even more bending resistance. This doesn't play a huge role in use, but with so many good options, you have to draw you line somewhere. Given the additional cost, why do they bend the plate like this? Some keyboards have the plate connected to ground, and I have one that has the metal plate grounded on one side, and a mettal bottom plate on he case on the other, making almost a full faraday cage.
All this methodology and observations reflect my interest in engineering design, and how it applies to keyboards and manufacturing, it's my main interest, here (That, and then applying it to DIY). Others are more interested in tweaks and maximizing the feel of the keyboard. They'll take PCB vs. plate mounting, compare cherry vs. costar stabilizers, add O-rings, thick vs. thin keycaps, Lubricants, custom springs, stickers, etc. It's almost the oeneophile approach (Sharpening your senses to be very good at distinguishing minute differences).
I recommend you consider what you are interested in most (Or just pick something) then ask about something specific. I can't speak for anyone else, but I'd gladly answer your questions.
