I'd like to visually see how some of the keyboard layouts in X.org look like, as an example in Windows I can see them with a program called Microsoft Keyboard Layout Creator or even on Wikipedia.
Additionally, from where the layouts to X.org came from? some of them (namely: US International) are very different from their Windows counterparts.
Edit: I would like to see all the possibilities with Ctrl, Shift, AltGr, etc., like in Wikipedia's Keyboard layout page:
(insert image of US International layout, by anybody who has more reputation)