Did you grab the cutaway buckling spring gif thats floating around?
Maybe cite some text from the buckling spring or model m wikipedia pages?
You have coverage of the main available mechanical switch types (Cherry, BS, Capacitive, etc)?
Maybe a bit on key layouts (ANSI, ISO, 101, 104, TKL)?
History on where QWERTY came from, and the other options (DVORAK, AZERTY, etc).
USB, PS2, AT - NKRO, 2KRO, etc
Disadvantages of rubber dome KBs?
Just throwing ideas out...