[Wikipedia:Keyboard_layout] has images of keyboard layouts from different countries.

[http://www.microsoft.com/globaldev/reference/keyboards.mspx] can display different keayboard layouts.


All special markup is easily available.



All wikicreole markup characters are visible on UK keyboards; accessible either by single key press or Shift+ key press.



The backslash (\), pipe (|), square brackets ([]), curly braces ({}) and single quotation mark (') require pressing an additional function key on polish(214) keyboard. The morep opular polish(programmers) keyboard layout is practically identical to the US layout.



Nearly all markup needs an additional key, either Shift+key or AltGr+key. But at least all the symbols are visible on the keyboard. 

Also see [OLPC keyboards].